US20110093083A1 - Distal femoral knee prostheses - Google Patents
Distal femoral knee prostheses Download PDFInfo
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- US20110093083A1 US20110093083A1 US12/974,018 US97401810A US2011093083A1 US 20110093083 A1 US20110093083 A1 US 20110093083A1 US 97401810 A US97401810 A US 97401810A US 2011093083 A1 US2011093083 A1 US 2011093083A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/38—Joints for elbows or knees
- A61F2/3859—Femoral components
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30317—The prosthesis having different structural features at different locations within the same prosthesis
- A61F2002/30324—The prosthesis having different structural features at different locations within the same prosthesis differing in thickness
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
- A61F2002/30616—Sets comprising a plurality of prosthetic parts of different sizes or orientations
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30667—Features concerning an interaction with the environment or a particular use of the prosthesis
Definitions
- the present invention relates generally to orthopedic prosthetic devices and, in particular, to distal femoral knee prostheses.
- TKR total knee replacement
- TKA total knee arthroplasty
- distal femoral knee prostheses are provided in a range of varying sizes and are selected by surgeons to best fit the anatomy of a particular patient, improvements in the design of distal femoral knee prostheses are desired.
- the present invention provides a set of distal femoral knee prostheses which are designed to be more narrow in medial/lateral (“M/L”) dimensions with increasing anterior/posterior (“A/P”) size than existing prostheses to more closely correspond to the physical anatomy of female patients.
- the prostheses are designed to have a substantially trapezoidal shape or profile when viewed distally which features a more pronounced narrowing of the M/L dimensions beginning at the posterior end of the prostheses and progressing anteriorly to the anterior end of the prostheses.
- the present disclosure provides a set of distal femoral prostheses particularly adapted for female anatomy, each femoral prosthesis including a distal nonarticulating surface having an anterior end and a posterior end, including a plurality of prostheses each having an overall anterior/posterior dimension defined between points located most anteriorly and most posteriorly on each prosthesis and a medial/lateral dimension defined between points located most medially and most laterally at anterior/posterior locations defined by the anterior end of the distal nonarticulating surface on each prosthesis; at least some of the prostheses having an overall anterior/posterior dimension and a medial/lateral dimension falling below a conceptual boundary defined by a line connecting a first point and a second point, the first point having an approximately 52.0 mm overall anterior/posterior dimension and an approximately 49.0 mm medial/lateral dimension, and the second point having an approximately 77.0 mm overall anterior/posterior dimension and an approximately 67.0 mm medial/lateral dimension; wherein the line is defined by the following equation: (media
- each femoral prosthesis including a distal nonarticulating surface having an anterior end and a posterior end, including a plurality of prostheses each having an overall anterior/posterior dimension defined between points located most anteriorly and most posteriorly on each prosthesis and a medial/lateral dimension defined between points located most medially and most laterally at anterior/posterior locations substantially equidistant from the anterior end of the distal nonarticulating surface and the posterior end of the distal nonarticulating surface; at least some of the prostheses having an overall anterior/posterior dimension and a medial/lateral dimension falling below a conceptual boundary defined by a line connecting a first point and a second point, the first point having an approximately 52.0 mm overall anterior/posterior dimension and an approximately 55.0 mm medial/lateral dimension, and the second point having an approximately 77.0 mm overall anterior/posterior dimension and an approximately 78.5 mm medial/lateral dimension;
- FIG. 1 is a side view of an exemplary distal femoral prosthesis in accordance with the present invention
- FIG. 2 is another side view of the prosthesis of FIG. 1 , illustrating certain dimensions thereof;
- FIG. 3 is a distal view of the prosthesis of FIG. 2 , viewed along line 3 - 3 of FIG. 2 and shown superimposed on a prosthesis;
- FIG. 4 further illustrates the anatomical M/L vs. A/P dimensional relationship of the prosthesis of FIG. 3 at dimension “B-B”;
- FIG. 5 is a graph illustrating a representative anatomical mid-box M/L vs. A/P dimensional relationship with respect to male and female femurs of various size;
- FIG. 5A is a view of an anatomic overall A/P dimension for a representative femur
- FIG. 5B is a view of an anatomic mid-box M/L dimension for a representative femur
- FIG. 6 is a graph of mid-box M/L vs. overall A/P for prostheses designed in accordance with the present invention as compared with several prostheses;
- FIG. 7 is a graph of anterior M/L along a dimension “B-B” vs. overall A/P for prostheses designed in accordance with the present invention as compared with several prostheses;
- FIG. 8 is a graph of posterior M/L vs. overall A/P for prostheses designed in accordance with the present invention as compared with several prostheses;
- FIG. 9 is a graph of the ratio of (mid-box M/L/overall A/P) vs. overall A/P for the prostheses of FIG. 6 ;
- FIG. 10 is a graph of the ratio of (anterior M/L along dimension “B-B”/overall A/P) vs. overall A/P for the prostheses of FIG. 7 ;
- FIG. 11 is a graph of the ratio of (posterior M/L/overall A/P) vs. overall A/P for the prostheses of FIG. 8 ;
- FIG. 12 is a distal view of an exemplary prosthesis designed in accordance with the present invention, shown superimposed on another prosthesis and illustrating the profiles and the distal taper angles of same;
- FIG. 13 is a graph of distal taper angle vs. overall A/P for prostheses designed in accordance with the present invention as compared with several prostheses;
- FIG. 14 is a distal view of an exemplary prosthesis
- FIG. 15 is a side view of the prosthesis of FIG. 14 , illustrating the recessed patellar sulcus thereof as compared with another prosthesis;
- FIG. 16 is another side view of the prosthesis of FIG. 14 , illustrating the reduced profile of the anterior condyles thereof as compared with another prosthesis;
- FIG. 17A is an A/P view of a prosthesis having conventional sulcus tracking
- FIG. 17B is an A/P view of an exemplary prosthesis in accordance with the present invention having a more lateralized sulcus tracking;
- FIG. 18 is a graph of A-A M/L vs. overall A/P for prostheses designed in accordance with the present invention as compared with several prostheses;
- FIG. 19 is a graph of the ratio of (A-A M/L/overall A/P) vs. overall A/P for the prostheses of FIG. 18 .
- anterior and distal mean nearer to or further from the root of a structure, respectively.
- distal femur is a part of the knee joint while the proximal femur is part of the hip joint.
- medial and lateral mean nearer the sagittal plane or further from the sagittal plane, respectfully.
- the sagittal plane is an imaginary vertical plane through the middle of the body that divides the body into right and left halves.
- Distal femoral knee prostheses made in accordance with the present invention are intended to be used to restore knee joint function in patients with severe pain and disability due, for example, to Rheumatoid arthritis, osteoarthritis, traumatic arthritis polyarthritis; collagen disorders, and/or avascular necrosis of the femoral condyle; post-traumatic loss of joint configuration, particularly when there is patellofemoral erosion, dysfunction or prior patellectomy; moderate valgus, varus, flexion deformities, or other conditions.
- a distal femoral prosthesis 50 for a TKR/TKA is shown, and generally includes an external articulating surface 52 and a bone contacting non-articulating internal surface 54 .
- Articulating surface 52 includes an anterior articulating surface 56 , a distal articulating surface 58 , a lateral posterior condylar articulating surface 60 , and a medial posterior condylar articulating surface 62 .
- Prosthesis 50 may be made of any biocompatible material having the mechanical properties necessary to function as a human knee distal femoral prosthesis.
- prosthesis 50 is made of titanium, titanium alloy, cobalt chrome alloy, stainless steel, or a ceramic.
- prosthesis 50 further includes patellar flange 64 including lateral and medial anterior condyles 66 and 68 , respectively, as well as patellar sulcus 70 disposed between lateral and medial anterior condyles 66 and 68 .
- Prosthesis 50 also includes lateral and medial posterior condyles 72 and 74 , respectively.
- the internal non-articulating portion 54 of prosthesis 50 is adapted to receive a resected distal femur.
- the surgical cuts made to the distal femur can be made by any means, in any sequence and in any configuration known to those of skill in the art of knee arthroplasty. Exemplary cut guides and processes for resecting the distal femur are shown and described in U.S. patent application Ser. No. 11/151,062, entitled ADJUSTABLE CUT GUIDE, filed on Jun. 13, 2005 (Attorney Docket Ref.: ZIM0231) and U.S. patent application Ser. No. 11/154,774, entitled MULTI-POSITIONABLE CUT GUIDE, filed on Jun. 16, 2005 (Attorney Docket Ref.: ZIM0234), assigned to the assignee of the present invention, the disclosures of which are expressly incorporated herein by reference.
- prosthesis 50 comprises a plurality of chamfer surfaces corresponding to a plurality of chamfer surfaces or “box cuts” made in the distal femur.
- Non-articular surface 54 may comprise a porous metal surface or any surface likely to promote the growth of bone therein.
- Non-articular surface 54 of prosthesis 50 preferably comprises anterior non-articular surface 76 , distal anterior non-articular surface 78 , distal non-articular surface 80 , two distal posterior non-articular surfaces 82 , and two posterior non-articular surfaces 84 .
- Distal non-articular surface 80 is generally flat and adapted to receive the distal-most surface of the resected femur.
- Distal non-articular surface 80 comprises an anterior end and a posterior end. The anterior end of distal non-articular surface 80 abuts one end of distal anterior non-articular surface 78 , which surface 78 also includes an anterior end and a posterior end.
- Surface 78 extends from surface 80 anteriorly and superiorly such that an obtuse angle is formed between surfaces 78 and 80 .
- Anterior non-articular surface 76 extends superiorly from the anterior end of surface 78 .
- distal non-articular surface 80 abuts one end of each distal posterior non-articular surface 82 , which surfaces 82 also include an anterior end and a posterior end.
- Surfaces 82 extend from surface 80 posteriorly and superiorly such that an obtuse angle is formed between surfaces 82 and 80 .
- Posterior non-articular surfaces 84 extend superiorly from the posterior ends of surfaces 82 , respectively.
- prostheses 50 As discussed in detail below, for many patients, particularly female patients, it is desirable to construct a set of prostheses 50 of varying size wherein the medial/lateral (“M/L”) width dimensions of the prostheses correspond more closely to the actual anatomical M/L width dimensions of the female femur and articulating surfaces.
- M/L medial/lateral
- prostheses 50 addresses this concern by offering the surgeon a set of narrower prostheses in the M/L dimensions for a given set of anterior/posterior (“A/P”) prosthesis sizes which will allow the surgeon to use a prosthesis with both a correct A/P size and more accurate and optimized M/L dimensions to provide optimal prosthesis sizing and joint kinematics as compared to conventional prostheses.
- A/P anterior/posterior
- Dimension “Posterior” is the M/L width at the widest point across the posterior condyles 72 , 74 of prosthesis 50 .
- Dimension “C-C” is the M/L width at the junction of the posterior distal facet and the distal plane, i.e., the M/L width along the intersection between distal non-articular surface 80 and distal posterior non-articular surfaces 82 .
- Dimension “B-B” is the M/L width at the junction of the distal plane and the distal anterior facet, i.e., the M/L width along the intersection between distal non-articular surface 80 and distal anterior non-articular surface 78 .
- Dimension “A-A” is the M/L width at the junction of the distal anterior facet and the posterior side of the anterior flange, i.e., the M/L width along the intersection of distal anterior non-articular surface 78 and anterior non-articular surface 76 .
- Dimension “MB” is the M/L width at a “mid-box” point of prosthesis 50 , i.e., along a line located on distal non-articular surface 80 substantially midway between Dimension C-C and Dimension B-B.
- the profiles of a set of prostheses 50 can also be described in terms of an increasing narrowing of the M/L dimensions relative to other prostheses on a per size basis. It has been observed that, for given female femurs, for example, the M/L dimensions are sometimes smaller than those of other prostheses of the proper A/P dimension. This discrepancy is small on the smaller A/P size prostheses and increases as the A/P size increases. For example, referring to FIG. 5 , a representative mid-box M/L vs. A/P dimensional relationship with respect to the actual human anatomy of distal femurs for males and females is shown.
- Representative female data is generally grouped together at lower values of mid-box M/L and representative male data is generally grouped together at higher values of mid-box M/L. Best fit lines for female and male data have been included on FIG. 5 to show the general trend of representative mid-box M/L dimensions. As may be seen from FIG. 5 , there exists a clear distinction between the representative M/L dimension vs. the A/P dimension for a female distal femur as compared to a male distal femur.
- FIGS. 5A and 5B show exemplary anatomic overall A/P and mid-box M/L dimensions for a representative femur.
- the overall A/P (“Overall A/P”) dimension is the distance between two lines perpendicular to distal non-articular surface 80 that pass through the most posterior point on the posterior face of exterior articulating surface 58 and through the most anterior point on the anterior face of exterior articulating surface 58 , respectively.
- FIG. 2 also shows a dashed outline of a resected femur with prosthesis 50 positioned thereon.
- the posterior M/L dimension and the A/P dimension increase at substantially the same rate with increasing A/P size.
- the slope of the ratio (posterior M/L/overall A/P) vs. overall A/P is less than ⁇ 0.0032 for the sets of prostheses of Embodiments 1 and 2 while the corresponding slope for the other sets of prostheses is greater than ⁇ 0.0032, indicating that the sets of prostheses of Embodiments 1 and 2 have an increasingly more pronounced narrowing of the posterior M/L dimension with increasing A/P size.
- the sets of prostheses designed in accordance with the present invention offer a surgeon a unique combination of implant posterior M/L widths with varying A/P size for an overall system or set of prostheses, wherein such sets of prostheses are more anatomically optimized for the female anatomy as compared with the sets of other prostheses.
- sets of prostheses of Embodiments 1 and 2 have a narrowing anterior M/L dimension with increasing A/P size, as indicated by slopes less than 0.78, for example, as opposed to a substantially parallel or one-to-one relationship between the anterior M/L dimension and the A/P dimension with increasing A/P size as in the sets of other prostheses, as indicated by slopes of 0.78 and above.
- the anterior M/L dimension and the A/P dimension increase at substantially the same rate with increasing A/P size.
- the slope of the ratio (anterior M/L “B-B”/overall A/P) vs.
- the dimensions “Posterior”, “MB”, “B-B”, and “Overall A/P” for conventional prostheses (“Conventional 3 ”, “Conventional 4 ”, and “Conventional 5 ” including five increasing sizes C through G) are compared with corresponding dimensions of a set of prostheses designed in accordance with the present invention (“Embodiment 3”, “Embodiment 4”, and “Embodiment 5” including five increasing sizes C through G).
- the values for Conventional 5 and Embodiment 5 may be average values of Conventionals 3 and 4 and Embodiments 3 and 4, respectively. These values are presented in Table 4 below.
- FIG. 8 is a graph of the dimension Posterior M/L vs. overall A/P for the following sets of prostheses, each in increasing sizes C through G: Conventional 5 , Embodiment 5, as well as eight other sets of competitive prostheses, designated Competitive 1 , Competitive 2 , Competitive 3 , Competitive 4 , Competitive 5 , Competitive 6 , Competitive 7 , and Competitive 8 .
- Table 5 sets forth the results of a first order equation fit to each of the data sets shown in FIGS. 6 , 7 , and 8 as well as for the data sets of Embodiment 5 and Conventional 5 in Table 4.
- the slope of posterior M/L dimension with increasing A/P size for prostheses 50 may be as small as approximately 0.50, 0.55, 0.60, or 0.65 or as large as approximately 0.85, 0.84, 0.83, 0.81, 0.80, 0.75, or 0.70.
- the slope of posterior M/L dimension with increasing A/P size for prostheses 50 is approximately 0.80.
- the posterior M/L dimension for prostheses 50 increases at a lesser rate than the corresponding overall A/P dimension.
- the posterior M/L dimension and the A/P dimension increase at substantially the same rate with increasing A/P size.
- the sets of prostheses designed in accordance with the present invention offer a surgeon a unique combination of implant posterior M/L widths with varying A/P size for an overall system or set of prostheses, wherein such sets of prostheses are more anatomically optimized for the female anatomy as compared with the sets of other prostheses.
- sets of prostheses of Embodiments 3, 4, and 5 have a narrowing B-B M/L dimension with increasing A/P size, as indicated by slopes less than approximately 0.77, for example, as opposed to a substantially parallel or one-to-one relationship between the B-B M/L dimension and the A/P dimension with increasing A/P size as in the sets of other prostheses, as indicated by slopes of 0.78 and above.
- the slope of the B-B M/L dimension with increasing A/P size for prostheses 50 may be as small as approximately 0.30, 0.35, 0.40, or 0.45 or as large as 0.77, 0.76, 0.75, 0.74, 0.72, 0.70, 0.65, 0.60, or 0.50.
- the slope is of the B-B M/L dimension with increasing A/P size for prostheses 50 is approximately 0.46.
- the B-B M/L dimension for prostheses 50 increases at a lesser rate than the corresponding overall A/P dimension.
- the B-B M/L dimension and the A/P dimension increase at substantially the same rate with increasing A/P size.
- sets of prostheses of Embodiments 3, 4, and 5 have a narrowing MB M/L dimension with increasing A/P size, as indicated by slopes less than 0.76, for example, as opposed to a substantially parallel or one-to-one relationship between the MB M/L dimension and the A/P dimension with increasing A/P size as in the sets of other prostheses, as indicated by slopes of 0.77 and above.
- the slope of the MB M/L dimension with increasing A/P size for prostheses 50 may be as small as approximately 0.40, 0.45, 0.50, 0.55, or 0.57 or as large as approximately 0.76, 0.75, 0.74, 0.73, 0.72, 0.71, 0.70, 0.65, or 0.60.
- the slope of the MB M/L dimension with increasing A/P size for prostheses 50 is approximately 0.60.
- the MB M/L dimension for prostheses 50 increases at a lesser rate than the corresponding overall A/P dimension.
- the MB M/L dimension and the A/P dimension increase at substantially the same rate with increasing A/P size.
- the prostheses designed in accordance with the present invention offer a surgeon a unique combination of implant M/L widths as an overall system of prostheses, wherein such sets of prostheses are more anatomically optimized for the female anatomy as compared with the sets of other prostheses.
- the range of values for Embodiment 5 generally falls underneath a conceptual boundary, as shown by a solid dashed line.
- the boundary is essentially defined by two points defined by coordinates given by (Overall A/P dimension, MB Dimension): A first point (“First Point”)-(52.0, 55.0) and a second point (“Second Point”)-(77.0, 78.5).
- the range of values for Embodiment 5 generally falls underneath a conceptual boundary, as shown by a solid dashed line.
- the boundary is essentially defined by two points defined by coordinates given by (Overall A/P dimension, B-B Dimension): A first point (“First Point”)-(52.0, 49.0) and a second point (“Second Point”)-(77.0, 67.0).
- FIG. 9 is a graph of the ratio of (MB M/L/Overall A/P) vs. Overall A/P for some of the prostheses described above with respect to FIG. 6 .
- FIG. 10 is a graph of the ratio of (B-B M/L/Overall A/P) vs. Overall A/P for some of the prostheses described above with respect to FIG. 7 .
- FIG. 11 is a graph of the ratio of (Posterior M/L/Overall A/P) vs. Overall A/P for some of the prostheses described above with respect to FIG. 8 .
- Table 7 sets forth the results of a first order equation fit to each of the data sets shown in FIGS. 9 , 10 , and 11 as well as for the data sets of Embodiments 3 and 4 and Conventional 3 and 4 in Table 6.
- the sets of prostheses designed in accordance with the present invention offer a surgeon a unique combination of implant posterior M/L widths with varying A/P size for an overall system or set of prostheses, wherein such sets of prostheses are more anatomically optimized for the female anatomy as compared with the sets of other prostheses.
- overall A/P is less than ⁇ 0.0032 for the sets of prostheses of Embodiments 3, 4, and 5, while the corresponding slope for the other sets of prostheses is greater than or equal to ⁇ 0.0032, indicating that the sets of prostheses of Embodiments 3, 4, and 5 have increasingly more pronounced narrowing of the B-B M/L dimension with increasing A/P size.
- Overall A/P is less than ⁇ 0.0054 for the sets of prostheses of Embodiments 3, 4, and 5, while the corresponding slope for the other sets of prostheses is greater than or equal to ⁇ 0.0054, indicating that the sets of prostheses of Embodiments 3, 4, and 5 have increasingly more pronounced narrowing of the B-B M/L dimension with increasing A/P size.
- Prostheses 50 may have slope values for the ratios of MB M/L/Overall A/P vs.
- the prostheses designed in accordance with the present invention offer a surgeon a unique combination of implant M/L widths as an overall system of prostheses, wherein such sets of prostheses are more anatomically optimized for the female anatomy as compared with the sets of other prostheses.
- the range of values for Embodiment 5 generally falls underneath a conceptual boundary, as shown with a solid dashed line.
- the boundary is defined by two points defined by coordinates given by (Overall A/P dimension, MB M/L/Overall A/P ratio): A first point (“First Point”)-(52.0, 1.06) and a second point (“Second Point”)-(77.0, 1.02).
- the range of values for Embodiment 5 generally falls underneath a conceptual boundary, as shown with a solid dashed line.
- the boundary is defined by two points defined by coordinates given by (Overall A/P dimension, B-B M/L/Overall A/P ratio): A first point (“First Point”)-(52.0, 0.94) and a second point (“Second Point”)-(77.0, 0.87).
- FIG. 19 is a graph of the ratio of (A-A M/L/Overall A/P) vs. Overall A/P for the prostheses described above with respect to FIG. 18 .
- Table 11 sets forth the results of a first order equation fit to the data sets shown in FIG. 19 as well as for the data sets of Embodiments 3 and 4 and Conventional 3 and 4 in Table 10.
- the sets of prostheses designed in accordance with the present invention offer a surgeon a unique combination of implant A-A M/L widths with varying A/P size for an overall system or set of prostheses, wherein such sets of prostheses are more anatomically optimized for the female anatomy as compared with the sets of other prostheses.
- distal taper angle is the angle between two lines on opposite sides of the prosthesis each connecting a point 90 on the edge of the anterior distal chamfer, i.e., along dimension “B-B” and a point 92 on the edge of the posterior distal chamfer, i.e., along dimension “C-C”.
- distal taper angles DT 1 and DT 2 for prosthesis 50 and for another prosthesis are illustrated, respectively. It may be seen from FIG. 12 that the distal taper angle DT 1 for prosthesis 50 is greater than the distal taper angle DT 2 for the other prosthesis.
- FIG. 13 is a chart of distal taper angle vs. overall A/P for several of the prostheses described above. As before, a first order curve fit was applied to the data in FIG. 13 and the results are set forth below in Table 12.
- the distal taper angle curve for the set of prostheses of Embodiment 5 has a consistent upward slope as opposed to the randomized “see-saw” curves or flattened curves of the other sets of prostheses, indicating a more precise, parallel or substantial one-to-one relationship between distal taper angle and overall A/P with increasing A/P size for the set of prostheses of Embodiment 5.
- the slope of the distal taper angle with increasing A/P size for prostheses 50 may be as small as approximately 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, or 0.30 or as large as approximately 0.42, 0.39, 0.36, or 0.33.
- the slope of the distal taper angle with increasing A/P size for prostheses 50 is approximately 0.28.
- the Upper Boundary may be defined by a line connecting a first or lower left point (“First Upper Point”)-(52.0, 59.0) and a second or upper right point (“Second Upper Point”)-(77.0, 83.5).
- the Lower Boundary may be defined by three exemplary boundaries.
- Lower Boundary 1 may be defined by a line connecting a first or lower left point (“First Lower Point 1 ”)-(52.0, 51.0) and a second or upper right point (“Second Lower Point 1 ”)-(77.0, 73.0).
- the following equations may define the Upper and Lower Boundaries:
- the Lower Boundary may be defined by three exemplary boundaries.
- Lower Boundary 1 may be defined by a line connecting a first or lower left point (“First Lower Point 1 ”)-(52.0, 0.98) and a second or upper right point (“Second Lower Point 1 ”)-(77.0, 0.95).
- Lower Boundary 2 may be defined by a line connecting a first or lower left point (“First Lower Point 2 ”)-(52.0, 1.02) and a second or upper right point (“Second Lower Point 2 ”)-(77.0, 0.97).
- Embodiment 5 has MB M/L dimensions below the boundary defined by a line connecting the First Point (52.0, 55.0) and the Second Point (77.0, 78.5).
- all other standard aspect ratio prostheses have MB M/L dimensions which fall above the line given by the foregoing equation.
- Embodiment 5 has B-B M/L dimensions below the boundary defined by a line connecting the Third Point (52.0, 50.0) and the Fourth Point (77.0, 70.5).
- all other standard aspect ratio prostheses have B-B M/L dimensions which fall above the line given by the foregoing equation.
- Embodiment 5 has B-B M/L/Overall A/P ratios below the boundary defined by a line connecting the Third Point (52.0, 0.96) and the Fourth Point (77.0, 0.92).
- all other standard aspect ratio prostheses have B-B M/L/Overall A/P ratios which fall above the line given by the foregoing equation.
- Embodiment 5 has A-A M/L/Overall A/P ratios below the boundary defined by a line connecting the Third Point (52.0, 0.77) and the Fourth Point (77.0, 0.69).
- all other standard aspect ratio prostheses have A-A M/L/Overall A/P ratios which fall above the line given by the foregoing equation.
- Embodiments 3-5 have slopes of Posterior M/L dimension with increasing A/P size which are less than 0.98.
- Prostheses 50 may have slope values for the Posterior M/L dimension with increasing A/P size which may be as small as approximately 0.50, 0.55, 0.60, or 0.65 or as large as approximately 0.96, 0.95, 0.94, 0.91, 0.88, 0.85, 0.84, 0.83, 0.81, 0.80, 0.75, or 0.70.
- all other standard aspect ratio prostheses have slopes of Posterior M/L dimension with increasing A/P size which are greater than or equal to 0.98.
- Embodiments 3-5 have slopes of A-A M/L dimension with increasing A/P size which are less than 0.46.
- Prostheses 50 may have slope values for the A-A M/L dimension with increasing A/P size which may be as small as 0.15, 0.20, 0.25, or 0.30 or as large as 0.45, 0.44, 0.42, 0.40, 0.37, 0.34, or 0.31.
- all other standard aspect ratio prostheses have slopes of A-A M/L dimension with increasing A/P size which are greater than or equal to 0.46.
- Embodiments 3-5 have slopes for the ratios of Posterior M/L/Overall A/P vs. Overall A/P with increasing A/P size which are less than ⁇ 0.0020. Prostheses 50 may have slope values for the ratios of Posterior M/L/Overall A/P vs. Overall A/P with increasing A/P size which may be as small as ⁇ 0.0060, ⁇ 0.0055, ⁇ 0.0050, ⁇ 0.0045, ⁇ 0.0040 or as large as ⁇ 0.0021, ⁇ 0.0022, ⁇ 0.0025, ⁇ 0.0030, or ⁇ 0.0035. In contrast, all other standard aspect ratio prostheses have slopes for the ratios of Posterior M/L/Overall A/P vs. Overall A/P with increasing A/P size which are greater than or equal to ⁇ 0.0020.
- Embodiments 3-5 have slopes for the ratios of MB M/L/Overall A/P vs. Overall A/P with increasing A/P size which are less than ⁇ 0.0023. Prostheses 50 may have slope values for the ratios of MB M/L/Overall A/P vs. Overall A/P with increasing A/P size which may be as small as ⁇ 0.0075, ⁇ 0.0072, ⁇ 0.0069, ⁇ 0.0066, or ⁇ 0.0063 or as large as ⁇ 0.0022, ⁇ 0.0025, ⁇ 0.0030, ⁇ 0.0035, ⁇ 0.0040, ⁇ 0.0045, ⁇ 0.0050, ⁇ 0.0055, or ⁇ 0.0060. In contrast, all other standard aspect ratio prostheses have slopes for the ratios of MB M/L/Overall A/P vs. Overall A/P with increasing A/P size which are greater than or equal to ⁇ 0.0023.
- the slope value for the ratio of B-B M/L/Overall A/P vs. Overall A/P with increasing A/P size is approximately ⁇ 0.0069. In another exemplary embodiment, the slope value for the ratio of B-B M/L/Overall A/P vs. Overall A/P with increasing A/P size is approximately ⁇ 0.0068. In yet another exemplary embodiment, the slope value for the ratio of B-B M/L/Overall A/P vs. Overall A/P with increasing A/P size is approximately ⁇ 0.0071. In contrast, all other prostheses have slopes for the ratios of B-B M/L/Overall A/P vs. Overall A/P with increasing A/P size which are greater than or equal to ⁇ 0.0032.
- the prosthesis 50 includes a recessed or reduced profile patellar sulcus as well as a thinned or reduced profile anterior flange condyles in comparison with other prostheses to alleviate the potential for the thicknesses of the patellar sulcus and the anterior flange condyles to be greater than the thickness of the femoral bone which is resected during the TKR/TKA procedure.
- FIG. 14 a distal view of prosthesis 50 is shown, including sulcus 70 disposed between lateral and medial anterior condyles 66 and 68 , respectively.
- FIG. 15 is a side view of prosthesis 50 , in which the anterior profile of sulcus 70 of prosthesis 50 in accordance with the present invention is shown as curve 94 , and the anterior profile of the sulcus of another prosthesis is represented by curve 96 .
- a line parallel to non-articular anterior surface 76 and tangent to curve 94 or 96 at an anterior most point thereof may be used to define dimension D 1 .
- Dimension D 1 represents the maximum thickness of sulcus 70 , i.e., the width of sulcus 70 between non-articular anterior surface 76 and an anterior most point along curve 94 or curve 96 .
- curve 94 of sulcus 70 of prosthesis 50 is recessed, or shifted posteriorly, as compared to curve 96 of the sulcus of another prosthesis, wherein dimension D 1 of prosthesis 50 is less than dimension D 1 of the other prosthesis.
- recessing the patellar sulcus 70 of prostheses 50 will allow the patella to articulate slightly more posterior than in other prostheses which will reduce the likelihood of the thickness of the patellar sulcus to be greater than the thickness of the femoral bone which is resected when the joint is in extension and early flexion.
- curve 102 of at least one of the lateral and medial anterior condyles 66 and 68 of prosthesis 50 is recessed, or shifted posteriorly, as compared to curve 104 of the anterior condyles of another prosthesis, wherein dimension D 2 of prosthesis 50 is less than dimension D 2 of the other prosthesis.
- the reduction of the anterior flange condyle thickness reduces the anterior flange profile and creates smoother, less abrupt changes in geometry as the condyles blend to the edges of the components while maintaining adequate height to prevent subluxation of the patella.
- the sulcus and condyle thicknesses D 1 and D 2 respectively, of prostheses of Embodiment 5 are considerably reduced as compared to the other prostheses (Conventional 5 ).
- the sulcus thickness D 1 of an exemplary embodiment may range from about 2.5 mm to 3.2 mm and the condyle thickness D 2 may range from about 5.0 mm to 6.4 mm.
- the sulcus thickness D 1 of prostheses 50 may be as small as approximately 2.5, 2.6, 2.7, or 2.8 mm or as large as approximately 3.2, 3.1, 3.0, or 2.9 mm.
- the condyle thickness D 2 of prostheses 50 may be as small as approximately 4.0, 4.3, 4.7, 5.0, 5.2, 5.4, or 5.6 mm or as large as approximately 6.4, 6.2, 6.1, 6.0, or 5.8 mm.
- the present prostheses further include a modified patellar sulcus tracking to further optimize conformance of the prostheses with female anatomy.
- the Q-angle (“quadriceps angle”) is formed in the frontal plane by a pair of line segments, one extending from the tibial tubercle to the middle of the patella and the other extending from the middle of the patella to the anterior superior iliac spine (ASIS). In adults, the Q-angle is typically 14° for males and 17° for females, wherein the Q-angle for females is approximately 3° more lateral than that of males.
- lateralization angle 108 is approximately 7° in FIG. 17A and approximately 10° in FIG. 17B .
- FIGS. 17A and 17B show A/P views of a prosthesis and prosthesis 50 , respectively, with simulated patellas shown in FIGS. 17A and 17B as circular structures “PA” superimposed upon the anterior flanges of the prostheses.
- the patella will track within the patellar sulcus of the prosthesis.
- the vertex 106 of lateralization angle 108 ( FIGS. 17A and 17B ) is located at the intersection of a plane coincident with the flat, distal non articular surface 80 ( FIG. 15 ) of prosthesis 50 with curve 94 ( FIG. 15 ) of the patellar sulcus 70 .
- line 110 is drawn orthogonal to distal non articular surface 80 , and the end point 112 of the patellar sulcus 70 is defined as the center of the patellar sulcus 70 at a line 114 parallel to distal non articular surface 80 and disposed at varying heights “H” in accordance with varying prosthesis size.
- Line 118 connects vertex 106 with end point 112 of the patellar sulcus and the angle originating at vertex 106 between lines 110 and 118 is lateralization angle 108 .
- FIGS. 17A and 17B having varying height dimensions “H” indicated in Table 14 below between distal non articular surface 80 and line 114 , the distance between line 110 and point 112 , i.e., the lateralization distance, also varies as indicated in FIGS. 17A and 17B , wherein the foregoing data is summarized below in Table 14 for a prosthesis (Conventional 1 , FIG. 17A ) and prosthesis 50 (Embodiment 1, FIG. 17B ). Unless otherwise indicated, all numerical dimensional values presented herein are in millimeters (“mm”).
- Embodiment 1 Conventional 1 ⁇ Size (H) (FIG. 17A) (FIG. 17B) Embodiment 1 C 28.6 3.8 5.3 1.5 D 31.3 4.1 5.8 1.7 E 31.3 4.2 5.8 1.6 F 34.8 4.5 6.5 2.0 G 38.8 5.0 7.0 2.0
- the lateralization distance of prostheses 50 is increased with respect to other prostheses to optimize patella tracking with the prostheses to more closely conform to female anatomy.
- the lateralization distance is greater than 5.0 mm.
- the lateralization distance for prostheses 50 may be as small as approximately 5.0, 5.3, 5.6, or 5.9 mm or as large as approximately 7.0, 6.7, 6.4, or 6.1 mm.
Abstract
A set of distal femoral knee prostheses which are designed to be more narrow in medial/lateral dimensions with increasing anterior/posterior size than existing prostheses to more closely correspond to the physical anatomy of female patients. The prostheses are designed to have a substantially trapezoidal shape or profile when viewed distally which features a more pronounced narrowing of the medial/lateral dimensions beginning at the posterior end of the prostheses and progressing anteriorly to the anterior end of the prostheses. Additionally, the prostheses each include a reduced profile patellar sulcus and reduced profile anterior condyles to more closely conform to the anatomy of a resected femur, and also include sulcus tracking optimized to conform to female anatomy.
Description
- This application is a continuation-in-part of U.S. patent application Ser. No. 11/611,021, filed Dec. 14, 2006, entitled Distal Femoral Knee Prostheses, which claims the benefit under
Title 35, U.S.C. §119(e) of U.S. Provisional Patent Application Ser. No. 60/750,613, entitled Distal Femoral Knee Prostheses, filed Dec. 15, 2005, and U.S. Provisional Patent Application Ser. No. 60/805,933, entitled Distal Femoral Knee Prostheses, filed Jun. 27, 2006. This application hereby expressly incorporates by reference herein the entire disclosures of U.S. patent application Ser. No. 11/611,021, filed Dec. 14, 2006; U.S. Provisional Patent Application Ser. No. 60/750,613, filed Dec. 15, 2005; and U.S. Provisional Patent Application Ser. No. 60/805,933, filed Jun. 27, 2006. - This application claims the benefit under
Title 35, U.S.C. §119(e) of U.S. Provisional Patent Application Ser. No. 60/914,359, entitled Distal Femoral Knee Prostheses, filed Apr. 27, 2007, the disclosure of which is hereby expressly incorporated herein by reference. - 1. Field of the Invention
- The present invention relates generally to orthopedic prosthetic devices and, in particular, to distal femoral knee prostheses.
- 2. Description of the Related Art
- Disease and trauma affecting the articular surfaces of a knee joint are commonly effectively treated by surgically replacing the articulating ends of the femur and tibia with prosthetic femoral and tibial implants or prostheses according to a procedure known as a total knee replacement (“TKR”) or a total knee arthroplasty (“TKA”). The femoral and tibial implants are made of materials that exhibit a low coefficient of friction as they articulate against one another to restore normal knee function.
- Although distal femoral knee prostheses are provided in a range of varying sizes and are selected by surgeons to best fit the anatomy of a particular patient, improvements in the design of distal femoral knee prostheses are desired.
- The present invention provides a set of distal femoral knee prostheses which are designed to be more narrow in medial/lateral (“M/L”) dimensions with increasing anterior/posterior (“A/P”) size than existing prostheses to more closely correspond to the physical anatomy of female patients. The prostheses are designed to have a substantially trapezoidal shape or profile when viewed distally which features a more pronounced narrowing of the M/L dimensions beginning at the posterior end of the prostheses and progressing anteriorly to the anterior end of the prostheses. Additionally, the prostheses each include a reduced profile patellar sulcus and reduced profile anterior condyles to more closely conform to the anatomy of a resected femur, and also include sulcus tracking which is optimized to conform to female anatomy.
- In one form thereof, the present disclosure provides a set of distal femoral prostheses particularly adapted for female anatomy, each femoral prosthesis including a distal nonarticulating surface having an anterior end and a posterior end, including a plurality of prostheses each having an overall anterior/posterior dimension defined between points located most anteriorly and most posteriorly on each prosthesis and a medial/lateral dimension defined between points located most medially and most laterally at anterior/posterior locations defined by the anterior end of the distal nonarticulating surface on each prosthesis; at least some of the prostheses having an overall anterior/posterior dimension and a medial/lateral dimension falling below a conceptual boundary defined by a line connecting a first point and a second point, the first point having an approximately 52.0 mm overall anterior/posterior dimension and an approximately 49.0 mm medial/lateral dimension, and the second point having an approximately 77.0 mm overall anterior/posterior dimension and an approximately 67.0 mm medial/lateral dimension; wherein the line is defined by the following equation: (medial/lateral dimension)=(0.72*overall anterior/posterior dimension)+11.56.
- In another form thereof, the present disclosure provides a set of distal femoral prostheses particularly adapted for female anatomy, each femoral prosthesis including a distal nonarticulating surface having an anterior end and a posterior end, including a plurality of prostheses each having an overall anterior/posterior dimension defined between points located most anteriorly and most posteriorly on each prosthesis and a medial/lateral dimension defined between points located most medially and most laterally at anterior/posterior locations substantially equidistant from the anterior end of the distal nonarticulating surface and the posterior end of the distal nonarticulating surface; at least some of the prostheses having an overall anterior/posterior dimension and a medial/lateral dimension falling below a conceptual boundary defined by a line connecting a first point and a second point, the first point having an approximately 52.0 mm overall anterior/posterior dimension and an approximately 55.0 mm medial/lateral dimension, and the second point having an approximately 77.0 mm overall anterior/posterior dimension and an approximately 78.5 mm medial/lateral dimension; wherein the line is defined by the following equation: (medial/lateral dimension)=(0.94*overall anterior/posterior dimension)+6.12.
- The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent and the invention itself will be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, wherein:
-
FIG. 1 is a side view of an exemplary distal femoral prosthesis in accordance with the present invention; -
FIG. 2 is another side view of the prosthesis ofFIG. 1 , illustrating certain dimensions thereof; -
FIG. 3 is a distal view of the prosthesis ofFIG. 2 , viewed along line 3-3 ofFIG. 2 and shown superimposed on a prosthesis; -
FIG. 4 further illustrates the anatomical M/L vs. A/P dimensional relationship of the prosthesis ofFIG. 3 at dimension “B-B”; -
FIG. 5 is a graph illustrating a representative anatomical mid-box M/L vs. A/P dimensional relationship with respect to male and female femurs of various size; -
FIG. 5A is a view of an anatomic overall A/P dimension for a representative femur; -
FIG. 5B is a view of an anatomic mid-box M/L dimension for a representative femur; -
FIG. 6 is a graph of mid-box M/L vs. overall A/P for prostheses designed in accordance with the present invention as compared with several prostheses; -
FIG. 7 is a graph of anterior M/L along a dimension “B-B” vs. overall A/P for prostheses designed in accordance with the present invention as compared with several prostheses; -
FIG. 8 is a graph of posterior M/L vs. overall A/P for prostheses designed in accordance with the present invention as compared with several prostheses; -
FIG. 9 is a graph of the ratio of (mid-box M/L/overall A/P) vs. overall A/P for the prostheses ofFIG. 6 ; -
FIG. 10 is a graph of the ratio of (anterior M/L along dimension “B-B”/overall A/P) vs. overall A/P for the prostheses ofFIG. 7 ; -
FIG. 11 is a graph of the ratio of (posterior M/L/overall A/P) vs. overall A/P for the prostheses ofFIG. 8 ; -
FIG. 12 is a distal view of an exemplary prosthesis designed in accordance with the present invention, shown superimposed on another prosthesis and illustrating the profiles and the distal taper angles of same; -
FIG. 13 is a graph of distal taper angle vs. overall A/P for prostheses designed in accordance with the present invention as compared with several prostheses; -
FIG. 14 is a distal view of an exemplary prosthesis; -
FIG. 15 is a side view of the prosthesis ofFIG. 14 , illustrating the recessed patellar sulcus thereof as compared with another prosthesis; -
FIG. 16 is another side view of the prosthesis ofFIG. 14 , illustrating the reduced profile of the anterior condyles thereof as compared with another prosthesis; -
FIG. 17A is an A/P view of a prosthesis having conventional sulcus tracking; -
FIG. 17B is an A/P view of an exemplary prosthesis in accordance with the present invention having a more lateralized sulcus tracking; -
FIG. 18 is a graph of A-A M/L vs. overall A/P for prostheses designed in accordance with the present invention as compared with several prostheses; and -
FIG. 19 is a graph of the ratio of (A-A M/L/overall A/P) vs. overall A/P for the prostheses ofFIG. 18 . - Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate exemplary embodiments of the invention, and such exemplifications are not to be construed as limiting the scope of the invention any manner.
- As used herein, the following directional definitions apply. Anterior and posterior mean nearer the front or nearer the rear of the body, respectively. Thus, with respect to the prostheses described herein, anterior refers to that portion of the knee that is nearer the front of the body, when the leg is in an extended position. Proximal and distal mean nearer to or further from the root of a structure, respectively. For example, the distal femur is a part of the knee joint while the proximal femur is part of the hip joint. Finally, the adjectives medial and lateral mean nearer the sagittal plane or further from the sagittal plane, respectfully. The sagittal plane is an imaginary vertical plane through the middle of the body that divides the body into right and left halves.
- Distal femoral knee prostheses made in accordance with the present invention are intended to be used to restore knee joint function in patients with severe pain and disability due, for example, to Rheumatoid arthritis, osteoarthritis, traumatic arthritis polyarthritis; collagen disorders, and/or avascular necrosis of the femoral condyle; post-traumatic loss of joint configuration, particularly when there is patellofemoral erosion, dysfunction or prior patellectomy; moderate valgus, varus, flexion deformities, or other conditions.
- Referring initially to
FIG. 1 , a distalfemoral prosthesis 50 for a TKR/TKA according to one embodiment of the present invention is shown, and generally includes an external articulatingsurface 52 and a bone contacting non-articulatinginternal surface 54. Articulatingsurface 52 includes an anterior articulatingsurface 56, a distal articulatingsurface 58, a lateral posteriorcondylar articulating surface 60, and a medial posteriorcondylar articulating surface 62.Prosthesis 50 may be made of any biocompatible material having the mechanical properties necessary to function as a human knee distal femoral prosthesis. Preferably,prosthesis 50 is made of titanium, titanium alloy, cobalt chrome alloy, stainless steel, or a ceramic. Referring additionally toFIG. 3 ,prosthesis 50 further includespatellar flange 64 including lateral and medialanterior condyles patellar sulcus 70 disposed between lateral and medialanterior condyles Prosthesis 50 also includes lateral and medialposterior condyles 72 and 74, respectively. - Referring to
FIG. 1 , the internalnon-articulating portion 54 ofprosthesis 50 is adapted to receive a resected distal femur. The surgical cuts made to the distal femur can be made by any means, in any sequence and in any configuration known to those of skill in the art of knee arthroplasty. Exemplary cut guides and processes for resecting the distal femur are shown and described in U.S. patent application Ser. No. 11/151,062, entitled ADJUSTABLE CUT GUIDE, filed on Jun. 13, 2005 (Attorney Docket Ref.: ZIM0231) and U.S. patent application Ser. No. 11/154,774, entitled MULTI-POSITIONABLE CUT GUIDE, filed on Jun. 16, 2005 (Attorney Docket Ref.: ZIM0234), assigned to the assignee of the present invention, the disclosures of which are expressly incorporated herein by reference. - In a preferred embodiment,
prosthesis 50 comprises a plurality of chamfer surfaces corresponding to a plurality of chamfer surfaces or “box cuts” made in the distal femur.Non-articular surface 54 may comprise a porous metal surface or any surface likely to promote the growth of bone therein.Non-articular surface 54 ofprosthesis 50 preferably comprises anteriornon-articular surface 76, distal anteriornon-articular surface 78, distalnon-articular surface 80, two distal posterior non-articular surfaces 82, and two posterior non-articular surfaces 84. - Distal
non-articular surface 80 is generally flat and adapted to receive the distal-most surface of the resected femur. Distalnon-articular surface 80 comprises an anterior end and a posterior end. The anterior end of distalnon-articular surface 80 abuts one end of distal anteriornon-articular surface 78, which surface 78 also includes an anterior end and a posterior end.Surface 78 extends fromsurface 80 anteriorly and superiorly such that an obtuse angle is formed betweensurfaces non-articular surface 76 extends superiorly from the anterior end ofsurface 78. - The posterior end of distal
non-articular surface 80 abuts one end of each distal posteriornon-articular surface 82, which surfaces 82 also include an anterior end and a posterior end.Surfaces 82 extend fromsurface 80 posteriorly and superiorly such that an obtuse angle is formed betweensurfaces surfaces 82, respectively. - As discussed in detail below, for many patients, particularly female patients, it is desirable to construct a set of
prostheses 50 of varying size wherein the medial/lateral (“M/L”) width dimensions of the prostheses correspond more closely to the actual anatomical M/L width dimensions of the female femur and articulating surfaces. As described below,prostheses 50 addresses this concern by offering the surgeon a set of narrower prostheses in the M/L dimensions for a given set of anterior/posterior (“A/P”) prosthesis sizes which will allow the surgeon to use a prosthesis with both a correct A/P size and more accurate and optimized M/L dimensions to provide optimal prosthesis sizing and joint kinematics as compared to conventional prostheses. - In
FIG. 3 , the profile 86 ofprosthesis 50 is superimposed uponprofile 88 of another prosthesis. As described in detail below,prosthesis 50 has a unique, substantially trapezoidal shape or profile 86 when viewed distally with a more pronounced narrowing of the M/L dimensions as compared to the shape orprofile 88 of the other prosthesis starting, with reference to the resected femur, at the posterior distal facet and progressing anteriorly to the anterior distal facet. Referring toFIGS. 2 and 3 ,prosthesis 50 is shown and is characterized below with reference to the following directions: anterior “A”, posterior “P”, distal “D”, proximal “PR”, medial “M” and lateral “L”, as well as the following dimensions. Dimension “Posterior” is the M/L width at the widest point across theposterior condyles 72, 74 ofprosthesis 50. Dimension “C-C” is the M/L width at the junction of the posterior distal facet and the distal plane, i.e., the M/L width along the intersection between distalnon-articular surface 80 and distal posterior non-articular surfaces 82. Dimension “B-B” is the M/L width at the junction of the distal plane and the distal anterior facet, i.e., the M/L width along the intersection between distalnon-articular surface 80 and distal anteriornon-articular surface 78. Dimension “A-A” is the M/L width at the junction of the distal anterior facet and the posterior side of the anterior flange, i.e., the M/L width along the intersection of distal anteriornon-articular surface 78 and anteriornon-articular surface 76. Dimension “MB” is the M/L width at a “mid-box” point ofprosthesis 50, i.e., along a line located on distalnon-articular surface 80 substantially midway between Dimension C-C and Dimension B-B. - As described below, the profiles of a set of
prostheses 50 can also be described in terms of an increasing narrowing of the M/L dimensions relative to other prostheses on a per size basis. It has been observed that, for given female femurs, for example, the M/L dimensions are sometimes smaller than those of other prostheses of the proper A/P dimension. This discrepancy is small on the smaller A/P size prostheses and increases as the A/P size increases. For example, referring toFIG. 5 , a representative mid-box M/L vs. A/P dimensional relationship with respect to the actual human anatomy of distal femurs for males and females is shown. Representative female data is generally grouped together at lower values of mid-box M/L and representative male data is generally grouped together at higher values of mid-box M/L. Best fit lines for female and male data have been included onFIG. 5 to show the general trend of representative mid-box M/L dimensions. As may be seen fromFIG. 5 , there exists a clear distinction between the representative M/L dimension vs. the A/P dimension for a female distal femur as compared to a male distal femur.FIGS. 5A and 5B show exemplary anatomic overall A/P and mid-box M/L dimensions for a representative femur. - In
FIG. 2 , the overall A/P (“Overall A/P”) dimension is the distance between two lines perpendicular to distalnon-articular surface 80 that pass through the most posterior point on the posterior face ofexterior articulating surface 58 and through the most anterior point on the anterior face ofexterior articulating surface 58, respectively.FIG. 2 also shows a dashed outline of a resected femur withprosthesis 50 positioned thereon. - As an exemplary comparison, the dimensions “Posterior”, “B-B”, “A-A”, and “Overall A/P” and the ratios of these values for conventional prostheses (“
Conventional 1”, including five increasing sizes C through G) are compared with corresponding dimensions and ratios of a set of prostheses designed in accordance with the present invention (“Embodiment 1”, including five increasing sizes C through G). These values are presented in Table 1 below. Unless otherwise indicated, all numerical dimensional values presented herein are in millimeters (“mm”) -
TABLE 1 Overall “B- “A- Overall “B- “A- SIZE A/P “Post.” B” A” A/P “Post.” B” A” Embodiment 1Conventional 1 C 52.2 58.0 49.6 41.1 53.5 60.0 53.6 45.1 D 56.3 61.3 51.5 42.6 57.6 64.0 55.8 46.5 E 60.2 64.5 53.5 43.7 61.5 68.0 59.3 49.1 F 64.2 67.9 55.4 45.0 65.4 72.0 63.2 52.0 G 69.2 71.0 57.3 46.3 70.4 76.5 67.3 56.2 Embodiment 1 - Conventional 1 - M/L/“Overall M/L/“Overall A/P” RATIOS A/P” RATIOS C 52.2 1.11 0.95 0.79 53.5 1.12 1.00 0.84 D 56.3 1.09 0.92 0.76 57.6 1.11 0.97 0.81 E 60.2 1.07 0.89 0.73 61.5 1.11 0.96 0.80 F 64.2 1.06 0.86 0.70 65.4 1.10 0.97 0.79 G 69.2 1.03 0.83 0.67 70.4 1.09 0.96 0.80 - Table 2 below sets forth the results of a first order equation fit to data sets for several sets of
prostheses including Conventional 1, Conventional 2 (which is similar to Conventional 1),Embodiment 1, Embodiment 2 (which is similar to Embodiment 1), as well as five other sets of competitive prostheses, designated Competitive 1, Competitive 2, Competitive 3, Competitive 4, and Competitive 5. The data sets include Posterior M/L vs. Overall A/P and the Ratio (Posterior M/L vs. Overall A/P) vs. Overall A/P. -
TABLE 2 Ratio (Posterior M/L/ Posterior M/L Overall A/P) vs. Overall A/P vs. Overall A/P Best fit regression line Best fit regression line Equation Slope Equation Slope Conventional 1 y = 0.9811x + 0.9811 y = −0.002x + −0.0020 7.595 1.2277 Conventional 2 y = 0.9878x + 0.9878 y = −0.0015x + −0.0015 6.0634 1.1798 Embodiment 1 y = 0.8036x + 0.8036 y = −0.0044x + −0.0044 16.228 1.3431 Embodiment 2 y = 0.809x + 0.8090 y = −0.0039x + −0.0039 14.987 1.2965 Competitive 1 y = 0.9411x + 0.9411 y = −0.0016x + −0.0016 7.1008 1.1565 Competitive 2 y = 0.987x + 0.9870 y = −0.0017x + −0.0017 6.8225 1.2015 Competitive 3 y = 0.976x + 0.9760 y = −0.0013x + −0.0013 5.7825 1.1521 Competitive 4 y = 0.9757x + 0.9757 y = −0.0016x + −0.0016 6.6279 1.1836 Competitive 5 y = 0.9336x + 0.9336 y = −0.0031x + −0.0031 11.318 1.3111 - From the data in Table 2, it may be seen that there is a difference in the slopes of the sets of prostheses of
Embodiments Embodiments Embodiments Embodiments - Table 3 below sets forth the results of a first order equation fit to data sets for several sets of
prostheses including Conventional 1, Conventional 2 (which is similar to Conventional 1),Embodiment 1, Embodiment 2 (which is similar to Embodiment 1), as well as five other sets of competitive prostheses, designated Competitive 1, Competitive 2, Competitive 3, Competitive 4, and Competitive 5. The data sets include B-B M/L vs. Overall A/P and the Ratio (B-B M/L vs. Overall A/P) vs. Overall A/P. -
TABLE 3 Ratio (Anterior M/L “B-B”/ Anterior M/L “B-B” Overall A/P) vs. Overall A/P vs. Overall A/P Best fit regression line Best fit regression line Equation Slope Equation Slope Conventional 1 y = 0.834x + 8.3768 0.8340 y = −0.0023x + −0.0023 1.112 Conventional 2 y = 0.8432x + 0.8432 y = −0.0018x + −0.0018 6.9003 1.0681 Embodiment 1 y = 0.4626x + 0.4626 y = −0.0071x + −0.0071 25.012 1.3173 Embodiment 2 y = 0.4626x + 0.4626 y = −0.0066x + −0.0066 25.012 1.2797 Competitive 1 y = 0.9062x + 0.9062 y = −0.0007x + −0.0007 3.2306 1.0017 Competitive 2 y = 0.8057x + 0.8057 y = −0.0031x + −0.0031 12.588 1.2033 Competitive 3 y = 0.893x + 5.5381 0.8930 y = −0.0012x + −0.0012 1.0578 Competitive 4 y = 1.0588x + 1.0588 y = −0.0001x + −0.0001 0.1731 1.0697 Competitive 5 y = 0.7937x + 0.7937 y = −0.0036x + −0.0036 12.218 1.217 - From the data in Table 3, it may be seen that there is a significant difference in slope for the sets of prostheses of
Embodiments Embodiments Embodiments Embodiments Embodiments - As another exemplary comparison, the dimensions “Posterior”, “MB”, “B-B”, and “Overall A/P” for conventional prostheses (“
Conventional 3”, “Conventional 4”, and “Conventional 5” including five increasing sizes C through G) are compared with corresponding dimensions of a set of prostheses designed in accordance with the present invention (“Embodiment 3”, “Embodiment 4”, and “Embodiment 5” including five increasing sizes C through G). In one embodiment, the values forConventional 5 andEmbodiment 5 may be average values ofConventionals -
TABLE 4 SIZE Overall A/P Posterior MB B-B Overall A/P Posterior MB B-B Embodiment 4 Conventional 4 C 53.3 58.0 55.9 50.2 54.4 60.0 58.6 53.6 D 57.5 61.4 58.4 52.0 58.6 64.0 62.1 55.8 E 61.2 64.7 60.8 54.0 62.5 68.0 65.9 59.3 F 65.3 68.1 63.5 56.0 66.5 72.0 70.2 63.2 G 70.4 71.5 66.0 58.0 71.5 76.5 74.0 67.3 Embodiment 3Conventional 3 C 52.3 58.0 55.9 50.2 53.5 60.0 58.6 53.6 D 56.4 61.4 58.4 52.0 57.6 64.0 62.0 55.7 E 60.2 64.7 60.8 54.0 61.5 68.0 65.9 59.3 F 64.2 68.1 63.5 56.0 65.5 72.0 70.2 63.2 G 69.4 71.5 66.0 58.0 70.5 76.5 74.0 67.2 Embodiment 5Conventional 5 C 52.8 58.0 55.9 50.2 54.0 60.0 58.6 53.6 D 56.9 61.4 58.4 52.0 58.1 64.0 62.0 55.8 E 60.7 64.7 60.8 54.0 62.0 68.0 65.9 59.3 F 64.8 68.1 63.5 56.0 66.0 72.0 70.2 63.2 G 69.9 71.5 66.0 58.0 71.0 76.5 74.0 67.3 -
FIG. 6 is a graph of the dimension mid-box M/L vs. overall A/P for the following sets of prostheses, each in increasing sizes C through G:Conventional 5,Embodiment 5, as well as eight other sets of competitive prostheses, designated Competitive 1, Competitive 2, Competitive 3, Competitive 4, Competitive 5, Competitive 6, Competitive 7, and Competitive 8. -
FIG. 7 is a graph of the dimension B-B M/L vs. overall A/P for the following sets of prostheses, each in increasing sizes C through G:Conventional 5,Embodiment 5, as well as eight other sets of competitive prostheses, designated Competitive 1, Competitive 2, Competitive 3, Competitive 4, Competitive 5, Competitive 6, Competitive 7, and Competitive 8. -
FIG. 8 is a graph of the dimension Posterior M/L vs. overall A/P for the following sets of prostheses, each in increasing sizes C through G:Conventional 5,Embodiment 5, as well as eight other sets of competitive prostheses, designated Competitive 1, Competitive 2, Competitive 3, Competitive 4, Competitive 5, Competitive 6, Competitive 7, and Competitive 8. - Table 5 below sets forth the results of a first order equation fit to each of the data sets shown in
FIGS. 6 , 7, and 8 as well as for the data sets ofEmbodiment 5 and Conventional 5 in Table 4. -
TABLE 5 Posterior Mid-box M/L vs. M/L vs. B-B M/L Overall A/P Overall A/P vs. Overall Best Fit Best Fit A/P Best Fit Regression Regression Regression Line Line Line Implant Slope y-Intercept Slope y-Intercept Slope y- Intercept Conventional 3 0.98 7.53 0.93 8.63 0.83 8.35 Conventional 4 0.98 6.82 0.93 8.02 0.83 7.66 Conventional 5 0.98 7.17 0.93 8.32 0.83 8.01 Embodiment 30.80 16.31 0.60 24.89 0.46 26.02 Embodiment 40.80 15.51 0.60 24.30 0.46 25.55 Embodiment 50.80 15.91 0.60 24.59 0.46 25.79 Competitive 1 1.06 1.27 1.01 3.36 0.94 1.61 Competitive 2 0.99 6.82 1.09 −1.10 0.80 12.80 Competitive 3 0.98 5.78 0.91 11.72 0.83 10.13 Competitive 4 0.98 6.63 1.02 3.40 1.06 0.17 Competitive 5 0.90 13.67 0.91 11.72 0.82 10.34 Competitive 6 1.06 0.61 1.08 −0.70 1.06 −4.03 Competitive 7 0.86 19.80 0.77 19.86 0.78 9.00 Competitive 8 1.10 0.72 1.08 0.87 1.05 1.08 - From the data in Table 5, it may be seen that there is a difference in the slopes of the sets of prostheses of
Embodiments Embodiments prostheses 50 may be as small as approximately 0.50, 0.55, 0.60, or 0.65 or as large as approximately 0.85, 0.84, 0.83, 0.81, 0.80, 0.75, or 0.70. In an exemplary embodiment, the slope of posterior M/L dimension with increasing A/P size forprostheses 50 is approximately 0.80. Thus, the posterior M/L dimension forprostheses 50 increases at a lesser rate than the corresponding overall A/P dimension. In contrast, in the sets of other prostheses, the posterior M/L dimension and the A/P dimension increase at substantially the same rate with increasing A/P size. In this manner, the sets of prostheses designed in accordance with the present invention offer a surgeon a unique combination of implant posterior M/L widths with varying A/P size for an overall system or set of prostheses, wherein such sets of prostheses are more anatomically optimized for the female anatomy as compared with the sets of other prostheses. - Furthermore, from the data in Table 5, it may be seen that there is a significant difference in slope for the sets of prostheses of
Embodiments Embodiments - Specifically, sets of prostheses of
Embodiments prostheses 50 may be as small as approximately 0.30, 0.35, 0.40, or 0.45 or as large as 0.77, 0.76, 0.75, 0.74, 0.72, 0.70, 0.65, 0.60, or 0.50. In an exemplary embodiment, the slope is of the B-B M/L dimension with increasing A/P size forprostheses 50 is approximately 0.46. Thus, the B-B M/L dimension forprostheses 50 increases at a lesser rate than the corresponding overall A/P dimension. In contrast, in the sets of other prostheses, the B-B M/L dimension and the A/P dimension increase at substantially the same rate with increasing A/P size. - Furthermore, sets of prostheses of
Embodiments prostheses 50 may be as small as approximately 0.40, 0.45, 0.50, 0.55, or 0.57 or as large as approximately 0.76, 0.75, 0.74, 0.73, 0.72, 0.71, 0.70, 0.65, or 0.60. In an exemplary embodiment, the slope of the MB M/L dimension with increasing A/P size forprostheses 50 is approximately 0.60. Thus, the MB M/L dimension forprostheses 50 increases at a lesser rate than the corresponding overall A/P dimension. In contrast, in the sets of other prostheses, the MB M/L dimension and the A/P dimension increase at substantially the same rate with increasing A/P size. - In this manner, the prostheses designed in accordance with the present invention offer a surgeon a unique combination of implant M/L widths as an overall system of prostheses, wherein such sets of prostheses are more anatomically optimized for the female anatomy as compared with the sets of other prostheses.
- Referring again to
FIG. 6 , the range of values forEmbodiment 5 generally falls underneath a conceptual boundary, as shown by a solid dashed line. Clearly, no other prostheses have MB M/L dimensions that fall underneath this conceptual boundary for the MB M/L dimensions and corresponding Overall A/P dimensions. The boundary is essentially defined by two points defined by coordinates given by (Overall A/P dimension, MB Dimension): A first point (“First Point”)-(52.0, 55.0) and a second point (“Second Point”)-(77.0, 78.5). Thus, the boundary defined by First Point and Second Point may be given by the equation MB M/L=0.94*Overall A/P+6.12. - Referring again to
FIG. 7 , the range of values forEmbodiment 5 generally falls underneath a conceptual boundary, as shown by a solid dashed line. Clearly, no other prostheses have B-B M/L dimensions that fall underneath this conceptual boundary for the B-B M/L dimensions and corresponding Overall A/P dimensions. The boundary is essentially defined by two points defined by coordinates given by (Overall A/P dimension, B-B Dimension): A first point (“First Point”)-(52.0, 49.0) and a second point (“Second Point”)-(77.0, 67.0). Thus, the boundary defined by First Point and Second Point may be given by the equation B-B M/L=0.72*Overall A/P+11.56. - As set forth in Table 6 below, the Overall A/P dimensions and the ratios of the dimensions “Posterior”, “MB”, and “B-B” vs. “Overall A/P” are given for
Embodiments -
TABLE 6 Ratio Ratio Ratio Ratio Ratio Ratio (Posterior (MB (B-B (Posterior (MB (B-B M/L/ M/L/ M/L/ M/L/ M/L/ M/L/ Overall Overall Overall Overall Overall Overall Overall SIZE A/P A/P) A/P) A/P) Overall A/P A/P) A/P) A/P) Embodiment 4Conventional 4 C 53.3 1.09 1.05 0.94 54.4 1.10 1.08 0.98 D 57.5 1.07 1.02 0.91 58.6 1.09 1.06 0.95 E 61.2 1.06 0.99 0.88 62.5 1.09 1.05 0.95 F 65.3 1.04 0.97 0.86 66.5 1.08 1.06 0.95 G 70.4 1.02 0.94 0.82 71.5 1.07 1.04 0.94 Embodiment 3Conventional 3 C 52.3 1.11 1.07 0.96 53.5 1.12 1.09 1.00 D 56.4 1.09 1.04 0.92 57.6 1.11 1.08 0.97 E 60.2 1.08 1.01 0.90 61.5 1.11 1.07 0.96 F 64.2 1.06 0.99 0.87 65.5 1.10 1.07 0.97 G 69.4 1.03 0.95 0.84 70.5 1.09 1.05 0.95 Embodiment 5Conventional 5 C 52.8 1.10 1.06 0.95 54.0 1.11 1.09 0.99 D 56.9 1.08 1.03 0.91 58.1 1.10 1.07 0.96 E 60.7 1.07 1.00 0.89 62.0 1.10 1.06 0.96 F 64.8 1.05 0.98 0.86 66.0 1.09 1.06 0.96 G 69.9 1.02 0.94 0.83 71.0 1.08 1.04 0.95 -
FIG. 9 is a graph of the ratio of (MB M/L/Overall A/P) vs. Overall A/P for some of the prostheses described above with respect toFIG. 6 .FIG. 10 is a graph of the ratio of (B-B M/L/Overall A/P) vs. Overall A/P for some of the prostheses described above with respect toFIG. 7 .FIG. 11 is a graph of the ratio of (Posterior M/L/Overall A/P) vs. Overall A/P for some of the prostheses described above with respect toFIG. 8 . - Table 7 below sets forth the results of a first order equation fit to each of the data sets shown in
FIGS. 9 , 10, and 11 as well as for the data sets ofEmbodiments Conventional -
TABLE 7 Ratio (B-B M/L vs. Ratio (Posterior Overall M/L vs. Ratio (Mid-box A/P) vs. Overall A/P) M/L vs. Overall Overall A/P vs. Overall A/P) vs. Best Fit A/P Best Fit Overall A/P Regression Regression Best Fit Line Line Regression y- y- Line Inter- Implant Slope Intercept Slope y-Intercept Slope cept Conventional −0.0020 1.23 −0.0023 1.21 −0.0023 1.11 3 Conventional −0.0017 1.20 −0.0020 1.18 −0.0020 1.08 4 Conventional −0.0018 1.21 −0.0021 1.20 −0.0022 1.10 5 Embodiment −0.0044 1.34 −0.0068 1.42 −0.0071 1.33 3 Embodiment −0.0041 1.31 −0.0064 1.39 −0.0068 1.30 4 Embodiment −0.0042 1.32 −0.0066 1.41 −0.0069 1.31 5 Competitive −0.0003 1.10 −0.0008 1.11 −0.0004 0.99 1 Competitive −0.0017 1.20 0.0003 1.06 −0.0032 1.21 2 Competitive −0.0013 1.15 −0.0003 1.09 −0.0024 1.14 3 Competitive −0.0016 1.18 −0.0009 1.13 −0.0001 1.07 4 Competitive −0.0032 1.32 −0.0032 1.31 −0.0025 1.15 5 Competitive −0.0001 1.08 0.0001 1.06 0.0010 0.94 6 Competitive −0.0053 1.51 −0.0054 1.43 −0.0024 1.08 7 Competitive −0.0002 1.13 −0.0003 1.11 −0.0003 1.09 8 - From the data in Table 7 it may be seen that there is a difference in the slopes of the sets of prostheses of
Embodiments Embodiments Embodiments Embodiments - Furthermore, it may be seen that there is a significant difference in slope for the sets of prostheses of
Embodiments Embodiments Embodiments Embodiments - Furthermore, the slope of the ratio (MB M/L/Overall A/P) vs. Overall A/P is less than −0.0054 for the sets of prostheses of
Embodiments Embodiments Prostheses 50 may have slope values for the ratios of MB M/L/Overall A/P vs. Overall A/P with increasing A/P size which may be as small as −0.0075, −0.0072, −0.0069, −0.0066, or −0.0063 or as large as −0.0055, −0.0057, −0.0059, or −0.0061. In this manner, the prostheses designed in accordance with the present invention offer a surgeon a unique combination of implant M/L widths as an overall system of prostheses, wherein such sets of prostheses are more anatomically optimized for the female anatomy as compared with the sets of other prostheses. - Referring again to
FIG. 9 , the range of values forEmbodiment 5 generally falls underneath a conceptual boundary, as shown with a solid dashed line. Clearly, no other prostheses have MB M/L/Overall A/P ratios that fall underneath this boundary for the MB M/L/Overall A/P ratios and corresponding Overall A/P dimensions. The boundary is defined by two points defined by coordinates given by (Overall A/P dimension, MB M/L/Overall A/P ratio): A first point (“First Point”)-(52.0, 1.06) and a second point (“Second Point”)-(77.0, 1.02). Thus, the boundary defined by First Point and Second Point may be given by the equation MB M/L/Overall A/P Ratio=−0.0015*Overall A/P+1.14. - Referring again to
FIG. 10 , the range of values forEmbodiment 5 generally falls underneath a conceptual boundary, as shown with a solid dashed line. Clearly, no other prostheses have B-B M/L/Overall A/P ratios that fall underneath this boundary for the B-B M/L/Overall A/P ratios and corresponding Overall A/P dimensions. The boundary is defined by two points defined by coordinates given by (Overall A/P dimension, B-B M/L/Overall A/P ratio): A first point (“First Point”)-(52.0, 0.94) and a second point (“Second Point”)-(77.0, 0.87). Thus, the boundary defined by First Point and Second Point may be given by the equation B-B M/L/Overall A/P Ratio=−0.0029*Overall A/P+1.09. - As another exemplary comparison, the dimensions “A-A” and “Overall A/P” for conventional prostheses (“
Conventional 3”, “Conventional 4”, and “Conventional 5” including five increasing sizes C through G) are compared with corresponding dimensions of a set of prostheses designed in accordance with the present invention (“Embodiment 3”, “Embodiment 4”, and “Embodiment 5” including five increasing sizes C through G). In one embodiment, the values forConventional 5 andEmbodiment 5 may be average values ofConventionals -
TABLE 8 SIZE Overall A/P A-A Overall A/ P A-A Embodiment 4 Conventional 4 C 53.3 41.0 54.4 45.0 D 57.5 42.6 58.6 46.3 E 61.2 43.6 62.5 48.9 F 65.3 44.9 66.5 51.7 G 70.4 46.1 71.5 56.0 Embodiment 3Conventional 3 C 52.3 41.0 53.5 45.0 D 56.4 42.6 57.6 46.4 E 60.2 43.6 61.5 48.5 F 64.2 44.9 65.5 51.6 G 69.4 46.1 70.5 55.7 Embodiment 5Conventional 5 C 52.8 41.0 54.0 45.0 D 56.9 42.6 58.1 46.3 E 60.7 43.6 62.0 48.7 F 64.8 44.9 66.0 51.7 G 69.9 46.1 71.0 55.8 -
FIG. 18 is a graph of the dimension A-A M/L vs. overall A/P for the following sets of prostheses, each in increasing sizes C through G:Conventional 5,Embodiment 5, as well as eight other sets of competitive prostheses, designated Competitive 1, Competitive 2, Competitive 3, Competitive 4, Competitive 5, Competitive 6, Competitive 7, and Competitive 8. - Table 9 below sets forth the results of a first order equation fit to the data sets shown in
FIG. 18 as well as for the data sets ofEmbodiments Conventional -
TABLE 9 A-A M/L vs. Overall A/P Best Fit Regression Line Implant Slope y- Intercept Conventional 3 0.64 9.66 Conventional 4 0.65 8.59 Conventional 5 0.65 9.13 Embodiment 30.30 25.78 Embodiment 40.30 25.47 Embodiment 50.30 25.63 Competitive 1 0.54 13.20 Competitive 2 0.46 19.33 Competitive 3 0.68 9.93 Competitive 4 0.76 6.05 Competitive 5 0.28 30.74 Competitive 6 0.86 2.98 Competitive 7 0.68 6.54 Competitive 8 0.69 10.46 - From the data in Table 9, it may be seen that there is a difference in the slopes of the sets of prostheses of
Embodiments Embodiments prostheses 50 is approximately 0.30. - As set forth in Table 10 below, the Overall A/P dimensions and the ratios of the dimension “A-A” vs. “Overall A/P” are given for
Embodiments -
TABLE 10 Ratio (A-A M/L/ Ratio (A-A M/L/ SIZE Overall A/P Overall A/P) Overall A/P Overall A/P) Embodiment 4Conventional 4 C 53.3 0.77 54.4 0.83 D 57.5 0.74 58.6 0.79 E 61.2 0.71 62.5 0.78 F 65.3 0.69 66.5 0.78 G 70.4 0.66 71.5 0.78 Embodiment 3Conventional 3 C 52.3 0.78 53.5 0.84 D 56.4 0.76 57.6 0.81 E 60.2 0.72 61.5 0.79 F 64.2 0.70 65.5 0.79 G 69.4 0.66 70.5 0.79 Embodiment 5Conventional 5 C 52.8 0.78 54.0 0.83 D 56.9 0.75 58.1 0.80 E 60.7 0.72 62.0 0.78 F 64.8 0.69 66.0 0.78 G 69.9 0.66 71.0 0.79 -
FIG. 19 is a graph of the ratio of (A-A M/L/Overall A/P) vs. Overall A/P for the prostheses described above with respect toFIG. 18 . - Table 11 below sets forth the results of a first order equation fit to the data sets shown in
FIG. 19 as well as for the data sets ofEmbodiments Conventional -
TABLE 11 Ratio (A-A M/L vs. Overall A/P) vs. Overall A/P Best Fit Regression Line Implant Slope y- Intercept Conventional 3 −0.0027 0.97 Conventional 4 −0.0023 0.94 Conventional 5 −0.0025 0.95 Embodiment 3−0.0071 1.15 Embodiment 4−0.0067 1.13 Embodiment 5−0.0069 1.14 Competitive 1 −0.0031 0.94 Competitive 2 −0.0049 1.08 Competitive 3 −0.0024 0.99 Competitive 4 −0.0016 0.96 Competitive 5 −0.0073 1.24 Competitive 6 0.0007 0.77 Competitive 7 −0.0019 0.90 Competitive 8 −0.0032 1.06 - From the data in Table 11 it may be seen that there is a difference in the slopes of the sets of prostheses of
Embodiments Embodiments Embodiments Embodiments - Referring again to
FIG. 18 , the range of values forEmbodiment 5 generally falls below the line of a conceptual boundary. The boundary may be defined by two points defined by coordinates given by (Overall A/P dimension, A-A M/L dimension): a First Point (52.0, 40.3) and a Second Point (77.0, 51.8). Thus, the boundary defines a line given by the following equation: A-A M/L=0.46*Overall A/P+16.38. - Referring again to
FIG. 19 , the range of values forEmbodiment 5 generally falls below the line of a conceptual boundary. The boundary may be defined by two points defined by coordinates given by (Overall A/P dimension, A-A M/L/Overall A/P ratio): a First Point (52.0, 0.78) and a Second Point (77.0, 0.67). Thus, the boundary defines a line given by the following equation: A-A M/L/Overall A/P=−0.0041*Overall A/P+0.99. - Another way of characterizing the design of the present prostheses is by distal taper angle, “DT”. As used herein and referring to
FIG. 12 , in which the profile 86 ofprosthesis 50 is superimposed uponprofile 88 of a prosthesis, the distal taper angle “DT” is the angle between two lines on opposite sides of the prosthesis each connecting apoint 90 on the edge of the anterior distal chamfer, i.e., along dimension “B-B” and apoint 92 on the edge of the posterior distal chamfer, i.e., along dimension “C-C”. InFIG. 12 , distal taper angles DT1 and DT2 forprosthesis 50 and for another prosthesis are illustrated, respectively. It may be seen fromFIG. 12 that the distal taper angle DT1 forprosthesis 50 is greater than the distal taper angle DT2 for the other prosthesis. -
FIG. 13 is a chart of distal taper angle vs. overall A/P for several of the prostheses described above. As before, a first order curve fit was applied to the data inFIG. 13 and the results are set forth below in Table 12. -
TABLE 12 Distal Taper Angle vs. Overall A/P Best fit regression line Equation Slope Conventional 3 y = 0.01x + 18.72 0.01 Conventional 4 y = 0.01x + 18.79 0.01 Conventional 5 y = 0.01x + 17.75 0.01 Embodiment 3 y = 0.28x + 7.10 0.28 Embodiment 4 y = 0.28x + 6.80 0.28 Embodiment 5 y = 0.28x + 6.95 0.28 Competitive 1 y = −0.15x + 24.81 −0.15 Competitive 2 y = 0.20x + 3.04 0.20 Competitive 3 y = −0.08x + 19.43 −0.08 Competitive 4 y = −0.24x + 18.77 −0.24 Competitive 5 y = −0.18x + 33.07 −0.18 Competitive 6 y = −0.19x + 21.99 −0.19 Competitive 7 y = −0.48x + 67.89 −0.48 Competitive 8 y = 0.07x + 3.42 0.07 - As may be seen from the data in Table 12, the ratio between distal taper angle and overall A/P of the prostheses of Embodiments 3-5 differs from the other prostheses. In particular, the foregoing data indicates that prostheses of Embodiments 3-5 have a more pronounced and consistent increase in distal taper angle with increasing A/P size, as evidenced by a slope of greater than 0.20. Additionally, as may be seen from
FIG. 13 , the set of prostheses ofEmbodiment 5 has greater distal taper angles throughout the range of sizes of the prostheses than the other sets of prostheses with positive slopes as set forth in Table 12. Further, the distal taper angle curve for the set of prostheses ofEmbodiment 5 has a consistent upward slope as opposed to the randomized “see-saw” curves or flattened curves of the other sets of prostheses, indicating a more precise, parallel or substantial one-to-one relationship between distal taper angle and overall A/P with increasing A/P size for the set of prostheses ofEmbodiment 5. In exemplary embodiments, the slope of the distal taper angle with increasing A/P size forprostheses 50 may be as small as approximately 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, or 0.30 or as large as approximately 0.42, 0.39, 0.36, or 0.33. In an exemplary embodiment, the slope of the distal taper angle with increasing A/P size forprostheses 50 is approximately 0.28. - As shown in
FIG. 13 , the range of values forEmbodiment 5 generally fall within the lines of a conceptual boundary, such as a four-sided polygon, as shown in solid dashed lines. Clearly, no other prostheses have distal taper angle values that fall within this range of values for the distal taper angle and corresponding Overall A/P dimensions. The four-sided polygon is essentially defined by four points defined by coordinates given by (Overall A/P dimension, Distal Taper Angle): An upper left corner (“1B”)-(52.0, 27.0°); A lower left corner (“4”)-(58.0, 22.5°); An upper right corner (“2”)-(77.0, 32.0°); and a lower right corner (“3”)-(77.0, 26.0°). Alternatively, the upper left corner may be at coordinates (52.0, 34.0°) (“1A”). Alternatively, points 1A, 1B, 2, 3, and 4 define a five-sided polygon which defines the conceptual boundary. The distal taper angles forEmbodiment 5 may be approximately equal to or greater than 21°. The values of distal taper angles forprostheses 50 may be as small as approximately 21°, 22°, 23°, 25°, or 27, or as large as approximately 35°, 33°, 31°, or 29°. - Referring again to
FIG. 8 , the sets of prostheses may be grouped into a standard aspect ratio category and a non-standard aspect ratio category. As used herein, the term “standard aspect ratio” describes a set of prostheses which, for overall A/P values ranging from approximately 52.0 mm to 77.0 mm, have corresponding posterior M/L dimensions which generally fall between an Upper Boundary and a Lower Boundary. The Upper Boundary and Lower Boundary may be defined by lines having points defined by coordinates given by (Overall A/P dimension, Posterior M/L dimension). The Upper Boundary may be defined by a line connecting a first or lower left point (“First Upper Point”)-(52.0, 59.0) and a second or upper right point (“Second Upper Point”)-(77.0, 83.5). The Lower Boundary may be defined by three exemplary boundaries. In one exemplary embodiment,Lower Boundary 1 may be defined by a line connecting a first or lower left point (“First Lower Point 1”)-(52.0, 51.0) and a second or upper right point (“Second Lower Point 1”)-(77.0, 73.0). In another exemplary embodiment,Lower Boundary 2 may be defined by a line connecting a first or lower left point (“First Lower Point 2”)-(52.0, 53.0) and a second or upper right point (“Second Lower Point 2”)-(77.0, 75.0). In yet another exemplary embodiment,Lower Boundary 3 may be defined by a line connecting a first or lower left point (“First Lower Point 3”)-(52.0, 55.0) and a second or upper right point (“Second Lower Point 3”)-(77.0, 77.0). For prostheses having overall A/P values ranging from approximately 52.0 mm to 77.0 mm, the following equations may define the Upper and Lower Boundaries: the Upper Boundary line may be defined by the following equation: Posterior M/L=0.98*Overall A/P+8.04; theLower Boundary 1 line may be defined by the following equation: Posterior M/L=0.88*Overall A/P+5.24; theLower Boundary 2 line may be defined by the following equation: Posterior M/L=0.88*Overall A/P+7.24; and theLower Boundary 3 line may be defined by the following equation: Posterior M/L=0.88*Overall A/P+9.24. - Referring again to
FIG. 11 , the Upper Boundary and Lower Boundary described above which are used to define the standard aspect ratio category for sets of prostheses may also be used with the posterior M/L/Overall A/P ratio for overall A/P values ranging from approximately 52.0 mm to 77.0 mm. The Upper Boundary and Lower Boundary may be defined by lines having points defined by coordinates given by (Overall A/P dimension, Posterior M/L/Overall A/P Ratio). The Upper Boundary may be defined by a line connecting a first or lower left point (“First Upper Point”)-(52.0, 1.13) and a second or upper right point (“Second Upper Point”)-(77.0, 1.08). The Lower Boundary may be defined by three exemplary boundaries.Lower Boundary 1 may be defined by a line connecting a first or lower left point (“First Lower Point 1”)-(52.0, 0.98) and a second or upper right point (“Second Lower Point 1”)-(77.0, 0.95).Lower Boundary 2 may be defined by a line connecting a first or lower left point (“First Lower Point 2”)-(52.0, 1.02) and a second or upper right point (“Second Lower Point 2”)-(77.0, 0.97).Lower Boundary 3 may be defined by a line connecting a first or lower left point (“First Lower Point 3”)-(52.0, 1.06) and a second or upper right point (“Second Lower Point 3”)-(77.0, 1.00). For prostheses having overall A/P values ranging from approximately 52.0 mm to 77.0 mm, the following equations may define the Upper and Lower Boundaries: the Upper Boundary line may be defined by the following equation: Posterior M/L/Overall A/P=−0.0020*Overall A/P+1.24; theLower Boundary 1 line may be defined by the following equation: Posterior M/L/Overall A/P=−0.0013*Overall A/P+1.05; theLower Boundary 2 line may be defined by the following equation: Posterior M/L/Overall A/P=−0.0018*Overall A/P+1.11; and theLower Boundary 3 line may be defined by the following equation: Posterior M/L/Overall A/P=−0.0023*Overall A/P+1.18. - Referring to
FIGS. 8 and 11 and applying the foregoing definition of standard aspect ratio, it may be seen that the prostheses described by Competitive 5 and Competitive 7 fall within the non-standard aspect ratio category. - Referring again to
FIG. 13 ,Embodiment 5 has a distal taper angle greater than or equal to 21°. In contrast, all other standard aspect ratio prostheses have a distal taper angle less than 21°. - Referring again to
FIG. 6 ,Embodiment 5 has MB M/L dimensions below the boundary defined by a line connecting the First Point (52.0, 55.0) and the Second Point (77.0, 78.5). Thus, for the range of Overall A/P values between 52.0 and 77.0,Embodiment 5 has MB M/L dimensions which fall below the line given by the following equation: MB M/L=0.94*Overall A/P+6.12. In contrast, all other standard aspect ratio prostheses have MB M/L dimensions which fall above the line given by the foregoing equation. - Referring again to
FIG. 9 ,Embodiment 5 has MB M/L/Overall A/P ratios below the boundary defined by a line connecting the First Point (52.0, 1.06) and the Second Point (77.0, 1.02). Thus, for the range of Overall A/P values between 52.0 and 77.0,Embodiment 5 has MB M/L/Overall A/P ratios which fall below the line given by the following equation: MB M/L/Overall A/P=−0.0015*Overall A/P+1.14. In contrast, all other standard aspect ratio prostheses have MB M/L/Overall A/P ratios which fall above the line given by the foregoing equation. - Referring again to
FIG. 7 ,Embodiment 5 has B-B M/L dimensions below the boundary defined by a line connecting the Third Point (52.0, 50.0) and the Fourth Point (77.0, 70.5). Thus, for the range of Overall A/P values between 52.0 and 77.0,Embodiment 5 has B-B M/L dimensions which fall below the line given by the following equation: B-B M/L=0.82*Overall A/P+7.36. In contrast, all other standard aspect ratio prostheses have B-B M/L dimensions which fall above the line given by the foregoing equation. - Referring again to
FIG. 10 ,Embodiment 5 has B-B M/L/Overall A/P ratios below the boundary defined by a line connecting the Third Point (52.0, 0.96) and the Fourth Point (77.0, 0.92). Thus, for the range of Overall A/P values between 52.0 and 77.0,Embodiment 5 has B-B M/L/Overall A/P ratios which fall below the line given by the following equation: B-B M/L/Overall A/P=−0.0018*Overall A/P+1.06. In contrast, all other standard aspect ratio prostheses have B-B M/L/Overall A/P ratios which fall above the line given by the foregoing equation. - Referring again to
FIG. 18 ,Embodiment 5 has A-A M/L dimensions below the boundary defined by a line connecting the Third Point (52.0, 40.1) and the Fourth Point (77.0, 53.5). Thus, for the range of Overall A/P values between 52.0 and 77.0,Embodiment 5 has A-A M/L dimensions which fall below the line given by the following equation: A-A M/L=0.54*Overall A/P+12.23. In contrast, all other standard aspect ratio prostheses have A-A M/L dimensions which fall above the line given by the foregoing equation. - Referring again to
FIG. 19 ,Embodiment 5 has A-A M/L/Overall A/P ratios below the boundary defined by a line connecting the Third Point (52.0, 0.77) and the Fourth Point (77.0, 0.69). Thus, for the range of Overall A/P values between 52.0 and 77.0,Embodiment 5 has A-A M/L/Overall A/P ratios which fall below the line given by the following equation: A-A M/L/Overall A/P=−0.0031*Overall A/P+0.93. In contrast, all other standard aspect ratio prostheses have A-A M/L/Overall A/P ratios which fall above the line given by the foregoing equation. - Referring again to Table 5, Embodiments 3-5 have slopes of Posterior M/L dimension with increasing A/P size which are less than 0.98.
Prostheses 50 may have slope values for the Posterior M/L dimension with increasing A/P size which may be as small as approximately 0.50, 0.55, 0.60, or 0.65 or as large as approximately 0.96, 0.95, 0.94, 0.91, 0.88, 0.85, 0.84, 0.83, 0.81, 0.80, 0.75, or 0.70. In contrast, all other standard aspect ratio prostheses have slopes of Posterior M/L dimension with increasing A/P size which are greater than or equal to 0.98. - Referring still to Table 5, Embodiments 3-5 have slopes of MB M/L dimension with increasing A/P size which are less than 0.91.
Prostheses 50 may have slope values for the MB M/L dimension with increasing A/P size which may be as small as approximately 0.40, 0.45, 0.50, 0.55, or 0.57 or as large as approximately 0.90, 0.89, 0.87, 0.84, 0.81, 0.79, 0.76, 0.75, 0.74, 0.73, 0.72, 0.71, 0.70, 0.65, or 0.60. In contrast, all other standard aspect ratio prostheses have slopes of MB M/L dimension with increasing A/P size which are greater than or equal to 0.91. - Referring again to Table 5, Embodiments 3-5 have slopes of B-B M/L dimension with increasing A/P size which are less than 0.80.
Prostheses 50 may have slope values for the B-B M/L dimension with increasing A/P size which may be as small as approximately 0.30, 0.35, 0.40, or 0.45 or as large as 0.79, 0.78, 0.77, 0.76, 0.75, 0.74, 0.72, 0.70, 0.65, 0.60, or 0.50. In contrast, all other standard aspect ratio prostheses have slopes of B-B M/L dimension with increasing A/P size which are greater than or equal to 0.80. - Referring to Table 9, Embodiments 3-5 have slopes of A-A M/L dimension with increasing A/P size which are less than 0.46.
Prostheses 50 may have slope values for the A-A M/L dimension with increasing A/P size which may be as small as 0.15, 0.20, 0.25, or 0.30 or as large as 0.45, 0.44, 0.42, 0.40, 0.37, 0.34, or 0.31. In contrast, all other standard aspect ratio prostheses have slopes of A-A M/L dimension with increasing A/P size which are greater than or equal to 0.46. - Referring to Table 7, Embodiments 3-5 have slopes for the ratios of Posterior M/L/Overall A/P vs. Overall A/P with increasing A/P size which are less than −0.0020.
Prostheses 50 may have slope values for the ratios of Posterior M/L/Overall A/P vs. Overall A/P with increasing A/P size which may be as small as −0.0060, −0.0055, −0.0050, −0.0045, −0.0040 or as large as −0.0021, −0.0022, −0.0025, −0.0030, or −0.0035. In contrast, all other standard aspect ratio prostheses have slopes for the ratios of Posterior M/L/Overall A/P vs. Overall A/P with increasing A/P size which are greater than or equal to −0.0020. - Referring again to Table 7, Embodiments 3-5 have slopes for the ratios of MB M/L/Overall A/P vs. Overall A/P with increasing A/P size which are less than −0.0023.
Prostheses 50 may have slope values for the ratios of MB M/L/Overall A/P vs. Overall A/P with increasing A/P size which may be as small as −0.0075, −0.0072, −0.0069, −0.0066, or −0.0063 or as large as −0.0022, −0.0025, −0.0030, −0.0035, −0.0040, −0.0045, −0.0050, −0.0055, or −0.0060. In contrast, all other standard aspect ratio prostheses have slopes for the ratios of MB M/L/Overall A/P vs. Overall A/P with increasing A/P size which are greater than or equal to −0.0023. - Referring again to Table 7, Embodiments 3-5 have slopes for the ratios of B-B M/L/Overall A/P vs. Overall A/P with increasing A/P size which are less than −0.0032.
Prostheses 50 may have slope values for the ratios of B-B M/L/Overall A/P vs. Overall A/P with increasing A/P size which may be as small as −0.0085, −0.0080, −0.0075, or −0.0070 or as large as −0.0031, −0.0032, −0.0034, −0.0037, −0.0040, −0.0045, −0.0050, −0.0055, −0.0060, or −0.0065. In an exemplary embodiment, the slope value for the ratio of B-B M/L/Overall A/P vs. Overall A/P with increasing A/P size is approximately −0.0069. In another exemplary embodiment, the slope value for the ratio of B-B M/L/Overall A/P vs. Overall A/P with increasing A/P size is approximately −0.0068. In yet another exemplary embodiment, the slope value for the ratio of B-B M/L/Overall A/P vs. Overall A/P with increasing A/P size is approximately −0.0071. In contrast, all other prostheses have slopes for the ratios of B-B M/L/Overall A/P vs. Overall A/P with increasing A/P size which are greater than or equal to −0.0032. - Referring again to Table 11, Embodiments 3-5 have slopes for the ratios of A-A M/L/Overall A/P vs. Overall A/P with increasing A/P size which are less than −0.0049.
Prostheses 50 may have slope values for the ratios of A-A M/L/Overall A/P vs. Overall A/P with increasing A/P size which may be as small as −0.0080, −0.0075, −0.0070, or −0.0065 or as large as −0.0050, −0.0051, −0.0053, −0.0055, or −0.0060. In contrast, all other standard aspect ratio prostheses have slopes for the ratios of A-A M/L/Overall A/P vs. Overall A/P with increasing A/P size which are greater than or equal to −0.0049. - In accordance with another aspect of the present invention, the
prosthesis 50 includes a recessed or reduced profile patellar sulcus as well as a thinned or reduced profile anterior flange condyles in comparison with other prostheses to alleviate the potential for the thicknesses of the patellar sulcus and the anterior flange condyles to be greater than the thickness of the femoral bone which is resected during the TKR/TKA procedure. - Referring to
FIG. 14 , a distal view ofprosthesis 50 is shown, includingsulcus 70 disposed between lateral and medialanterior condyles FIG. 15 is a side view ofprosthesis 50, in which the anterior profile ofsulcus 70 ofprosthesis 50 in accordance with the present invention is shown ascurve 94, and the anterior profile of the sulcus of another prosthesis is represented bycurve 96. A line parallel to non-articularanterior surface 76 and tangent tocurve sulcus 70, i.e., the width ofsulcus 70 between non-articularanterior surface 76 and an anterior most point alongcurve 94 orcurve 96. As may be seen fromFIG. 15 ,curve 94 ofsulcus 70 ofprosthesis 50 is recessed, or shifted posteriorly, as compared tocurve 96 of the sulcus of another prosthesis, wherein dimension D1 ofprosthesis 50 is less than dimension D1 of the other prosthesis. Advantageously, recessing thepatellar sulcus 70 ofprostheses 50 will allow the patella to articulate slightly more posterior than in other prostheses which will reduce the likelihood of the thickness of the patellar sulcus to be greater than the thickness of the femoral bone which is resected when the joint is in extension and early flexion. - Referring to
FIG. 16 , the anterior profile of lateral or medialanterior condyle prosthesis 50 in accordance with the present invention is shown as curve 102, and the anterior profile of an anterior condyle of another prosthesis is shown ascurve 104. Dimension D2 represents the maximum thickness, or depth, of one or both of the lateral and medial anterior condyles between non-articularanterior surface 76 and a line drawn parallel to surface 76 and tangent to curve 102 orcurve 104 at an anterior most point thereof. As may be seen fromFIG. 16 , curve 102 of at least one of the lateral and medialanterior condyles prosthesis 50 is recessed, or shifted posteriorly, as compared tocurve 104 of the anterior condyles of another prosthesis, wherein dimension D2 ofprosthesis 50 is less than dimension D2 of the other prosthesis. Advantageously, the reduction of the anterior flange condyle thickness reduces the anterior flange profile and creates smoother, less abrupt changes in geometry as the condyles blend to the edges of the components while maintaining adequate height to prevent subluxation of the patella. - In Table 13 below, dimensions D1 and D2 described above are shown in accordance with a set of prostheses 50 (Embodiment 5) compared to another set of prostheses (Conventional 5), as well as the differences between dimensions D1 and D2 of the present prosthesis and other prosthesis. Unless otherwise indicated, all numerical dimensional values presented herein are in millimeters (“mm”)
-
TABLE 13 Differences (Conventional 5 − Embodiment Conventional Embodiment 5 5 5) SIZE “D1” “D2” “D1” “D2” “D1” “D2” C 2.5 5.1 3.5 6.3 1.0 1.1 D 2.5 5.3 3.6 6.4 1.0 1.1 E 2.6 5.0 3.6 6.2 1.1 1.2 F 2.5 5.3 3.6 6.4 1.1 1.1 G 3.2 6.4 4.2 7.3 1.1 0.9 - As may be seen from Table 13, the sulcus and condyle thicknesses D1 and D2 respectively, of prostheses of
Embodiment 5 are considerably reduced as compared to the other prostheses (Conventional 5). In particular, the sulcus thickness D1 of an exemplary embodiment may range from about 2.5 mm to 3.2 mm and the condyle thickness D2 may range from about 5.0 mm to 6.4 mm. In exemplary embodiments, the sulcus thickness D1 ofprostheses 50 may be as small as approximately 2.5, 2.6, 2.7, or 2.8 mm or as large as approximately 3.2, 3.1, 3.0, or 2.9 mm. In exemplary embodiments, the condyle thickness D2 ofprostheses 50 may be as small as approximately 4.0, 4.3, 4.7, 5.0, 5.2, 5.4, or 5.6 mm or as large as approximately 6.4, 6.2, 6.1, 6.0, or 5.8 mm. - The present prostheses further include a modified patellar sulcus tracking to further optimize conformance of the prostheses with female anatomy. The Q-angle (“quadriceps angle”) is formed in the frontal plane by a pair of line segments, one extending from the tibial tubercle to the middle of the patella and the other extending from the middle of the patella to the anterior superior iliac spine (ASIS). In adults, the Q-angle is typically 14° for males and 17° for females, wherein the Q-angle for females is approximately 3° more lateral than that of males. Responsive to this observation, and as described in detail below, the end point of the
patellar sulcus 70 ofprostheses 50 is shifted 3° laterally with respect to other prostheses, i.e., in an exemplary embodiment,lateralization angle 108 is approximately 7° inFIG. 17A and approximately 10° inFIG. 17B . -
FIGS. 17A and 17B show A/P views of a prosthesis andprosthesis 50, respectively, with simulated patellas shown inFIGS. 17A and 17B as circular structures “PA” superimposed upon the anterior flanges of the prostheses. During articulation of the prosthesis, the patella will track within the patellar sulcus of the prosthesis. Referring toFIGS. 15 , 17A, and 17B, thevertex 106 of lateralization angle 108 (FIGS. 17A and 17B ) is located at the intersection of a plane coincident with the flat, distal non articular surface 80 (FIG. 15 ) ofprosthesis 50 with curve 94 (FIG. 15 ) of thepatellar sulcus 70. Fromvertex 106,line 110 is drawn orthogonal to distal nonarticular surface 80, and theend point 112 of thepatellar sulcus 70 is defined as the center of thepatellar sulcus 70 at a line 114 parallel to distal nonarticular surface 80 and disposed at varying heights “H” in accordance with varying prosthesis size.Line 118 connectsvertex 106 withend point 112 of the patellar sulcus and the angle originating atvertex 106 betweenlines lateralization angle 108. For a range of sizes C through G of prostheses represented inFIGS. 17A and 17B having varying height dimensions “H” indicated in Table 14 below between distal nonarticular surface 80 and line 114, the distance betweenline 110 andpoint 112, i.e., the lateralization distance, also varies as indicated inFIGS. 17A and 17B , wherein the foregoing data is summarized below in Table 14 for a prosthesis (Conventional 1,FIG. 17A ) and prosthesis 50 (Embodiment 1,FIG. 17B ). Unless otherwise indicated, all numerical dimensional values presented herein are in millimeters (“mm”). -
TABLE 14 Vertical Position Height From Lateralization Distance Change Distal Face Conventional 1 Embodiment 1Conventional 1 −Size (H) (FIG. 17A) (FIG. 17B) Embodiment 1 C 28.6 3.8 5.3 1.5 D 31.3 4.1 5.8 1.7 E 31.3 4.2 5.8 1.6 F 34.8 4.5 6.5 2.0 G 38.8 5.0 7.0 2.0 - As may be seen from Table 14, the lateralization distance of
prostheses 50 is increased with respect to other prostheses to optimize patella tracking with the prostheses to more closely conform to female anatomy. In an exemplary embodiment, the lateralization distance is greater than 5.0 mm. In an exemplary embodiment, the lateralization distance forprostheses 50 may be as small as approximately 5.0, 5.3, 5.6, or 5.9 mm or as large as approximately 7.0, 6.7, 6.4, or 6.1 mm. - While this invention has been described as having exemplary designs, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.
Claims (2)
1-6. (canceled)
7. A distal femoral prosthesis, comprising:
lateral and medial anterior condyles;
a non-articulating surface having a distal plane;
a patellar sulcus disposed between said lateral and medial anterior condyles, said sulcus having an end point located at a distance between 28.6 and 38.8 mm from said distal plane, said end point lateralized a distance between 5.3 and 7.0 mm from a line extending perpendicularly from said distal plane.
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US11/780,248 US20080058947A1 (en) | 2005-12-15 | 2007-07-19 | Distal femoral knee prostheses |
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US15/424,382 Active 2027-09-08 US10433966B2 (en) | 2005-12-15 | 2017-02-03 | Distal femoral knee prostheses |
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Also Published As
Publication number | Publication date |
---|---|
EP1968497B1 (en) | 2016-03-16 |
JP2009519781A (en) | 2009-05-21 |
CN101330883A (en) | 2008-12-24 |
AU2006325787A1 (en) | 2007-06-21 |
CA2641966C (en) | 2016-11-22 |
US20070260323A1 (en) | 2007-11-08 |
JP5275812B2 (en) | 2013-08-28 |
EP1968497A1 (en) | 2008-09-17 |
US10433966B2 (en) | 2019-10-08 |
US20170156872A1 (en) | 2017-06-08 |
WO2007070859A2 (en) | 2007-06-21 |
US9592127B2 (en) | 2017-03-14 |
JP5480223B2 (en) | 2014-04-23 |
JP2012000520A (en) | 2012-01-05 |
CN101330883B (en) | 2013-03-13 |
CA2641966A1 (en) | 2007-06-21 |
AU2006325787B2 (en) | 2013-07-18 |
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