WO2006119126A2 - Shaped osteochondral grafts and methods of using same - Google Patents
Shaped osteochondral grafts and methods of using same Download PDFInfo
- Publication number
- WO2006119126A2 WO2006119126A2 PCT/US2006/016491 US2006016491W WO2006119126A2 WO 2006119126 A2 WO2006119126 A2 WO 2006119126A2 US 2006016491 W US2006016491 W US 2006016491W WO 2006119126 A2 WO2006119126 A2 WO 2006119126A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- plug
- bone
- graft
- osteochondral
- patient
- Prior art date
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- 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
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
- A61F2230/0028—Shapes in the form of latin or greek characters
-
- 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
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
- A61F2230/0028—Shapes in the form of latin or greek characters
- A61F2230/005—Rosette-shaped, e.g. star-shaped
-
- 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
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0063—Three-dimensional shapes
- A61F2230/0069—Three-dimensional shapes cylindrical
-
- 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
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0063—Three-dimensional shapes
- A61F2230/0082—Three-dimensional shapes parallelepipedal
-
- 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
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
-
- 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
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00179—Ceramics or ceramic-like structures
Definitions
- the present invention relates generally to grafting for cartilage repair, and in one particular aspect to novel shaped osteochondral plug grafts and their use in articular cartilage resurfacing procedures.
- articular cartilage such as that which occurs in the knee joint, generally do not heal well due to the lack of nerves, blood vessels and a lymphatic system.
- Hyaline cartilage in particular has a limited capacity for repair, and lesions in this material without intervention typically form repair tissue lacking the biomechanical properties of normal cartilage.
- a number of techniques are used to treat patients having damaged articular cartilage.
- the most widely used techniques involve non-grafting repairs or treatments such as lavage, arthroscopic debridement, and repair stimulation.
- repair stimulation is conducted by drilling, abrasion arthroplasty or microfracture. The goal is to penetrate into subchondral bone to induce bleeding and fibrin clot formation. This promotes initial repair.
- the resulting formed tissue is often fibrous in nature and lacks the durability of normal cartilage.
- cells grown in culture are transplanted into an articulating cartilage lesion.
- One such process involves the culture of a patient's own cells, and the reimplantation of those cells in defective cartilage.
- an autologous periosteal flap with a cambium layer is used to seal the transplanted cells into place and act as mechanical barrier.
- osteochondral transplantation also known as "mosaicplasty" is used to repair articular cartilage.
- This procedures involves removing injured tissue from the articular defect and drilling cylindrical holes in the base of the defect and underlying bone.
- Cylindrical plugs of healthy cartilage and bone are obtained from another area of the patient, typically a lower-bearing region of the joint under repair, and are implanted into the drilled holes.
- allograft osteochondral plugs have been suggested for use in repairing articular cartilage defects. Such allograft osteochondral plugs have been used clinically to some extent, in either fresh or frozen forms.
- the present invention features the provision of plug implants having unique geometric and functional characteristics and their use in articular cartilage repair.
- aspects of the present invention relate to osteochondral plug grafts including at least one bone portion exhibiting a cross-sectional profile other than that of a circle and configured for stable, durable and interlocking receipt within a corresponding surgically created opening in subchondral bone.
- Such osteochondral grafts or corresponding synthetic grafts or implants can be used in repair procedures in which the graft or other implant cooperates with the opening so as to provide a mechanical stop to resist rotation of the graft within the hole.
- such grafts/implants can cooperate with bone surfaces of adjacent implanted osteochondral plugs to provide such a mechanical stop to resist rotation.
- effective and stable graft materials and techniques are provided for the repair of patient articular cartilage.
- One embodiment of the invention provides a method for repairing articular cartilage in a patient that includes implanting at least one osteochondral plug graft at an articular cartilage site in the patient, the plug graft including a cartilage layer attached to an underlying body of bone.
- the body of bone includes a bone sidewall positioned adjacent a separate bone surface.
- the bone sidewall and adjacent bone surface together are configured to provide a mechanical interlock that resists rotation of the implanted osteochondral plug graft.
- the osteochondral plug graft can advantageously be an allograft osteochondral plug graft for implantation in a human.
- the mechanical stop can be provided by at least one region in which rotation of the plug graft would cause a wall or wall portion of the plug to impinge upon a wall of patient bone or a wall of an adjacent implanted plug and stop rotation of the plug.
- mechanical interlocks apart from simple interference fits which involve only friction, are provided in accordance with this aspect of the invention.
- synthetic plug grafts with corresponding features can be used in similar methods.
- the present invention provides an osteochondral graft configured for stable implantation within a prepared surgical opening in subchondral bone of a patient at an articular cartilage site, the surgical opening having a three-dimensional contour other than a circular cylinder.
- the inventive osteochondral graft includes an osteochondral plug graft having a cartilage cap and a body of bone attached to the cartilage cap.
- the body of bone includes a stabilizing portion for receipt within the surgical opening, wherein the stabilizing portion of the bone body presents an external three-dimensional contour other than a circular cylinder.
- the stabilizing portion is further configured for mated receipt within the surgical opening to provide a mechanical interlock against rotation.
- osteochondral graft plugs include a body of bone having a cross-sectional profile that is non-circular but includes at least a portion defining an arc of a circle.
- such osteochondral graft plugs can take the form of multi-lobed grafts, wherein each lobe has a cross-sectional profile forming an arc of a circle.
- Such grafts may have two, three, four, or more such lobes.
- osteochondral graft plugs of the invention can have bone bodies with polygonal cross- sectional profiles such as triangular, rectangular (including square), heptagonal, hexagonal, etc. cross-sectional profiles.
- Such grafts, or synthetic grafts having similar features can for example be implanted into surgically prepared openings of similar shape to provide implanted grafts locked against rotation.
- embodiments of the invention provide grafts including a bone body having an ovate cross-sectional profile, which can be implanted in openings of similar shape.
- the present invention provides a grafting system for treating an articular cartilage site comprising a first plug graft and a second plug graft.
- the first and second plug grafts are configured to cooperate with one another to nest, to mechanically lock at least one of the grafts against rotation, and/or to mechanically lock the grafts against lateral separation, when implanted at an articular cartilage site in a patient.
- the plug grafts can be osteochondral plug grafts, or synthetic plug grafts.
- the present invention provides a graft for receipt within an opening in subchondral bone at an articular cartilage site of a patient, wherein the graft includes an osteochondral graft including a bone plug having an upper surface, sidewalls depending from the upper surface, and a lower surface, and a layer of cartilage attached to the upper surface of the bone plug.
- the bone plug further includes at least a portion wherein the bone plug sidewalls present a cross sectional profile selected from a non- circular profile that includes at least one circular arc, a polygonal profile, an ovate profile, and a multi-lobed profile having two to four lobes.
- Corresponding synthetic plug grafts also provide another feature of the invention.
- the present invention provides a method for repairing an articular cartilage site in a patient that includes providing a prepared surgical opening in subchondral bone of a patient at an articular cartilage site and inserting a plurality of graft plugs into said surgical opening, wherein the plurality of plugs together provides a plug assembly substantially filling the opening.
- mated plug assemblies can be used to provide close packing of plug grafts with minimal gaps therebetween, and enhanced resurfacing effects at the site being treated.
- the graft plugs are desirably osteochondral plug grafts but in certain embodiments can also be synthetic plugs.
- Another embodiment of the invention provides a graft system configured for stable implantation within a prepared surgical opening in subchondral bone of a patient at an articular cartilage site, wherein the system includes a plurality of graft plugs together providing a plug assembly configured to substantially fill the surgical opening.
- FIGS. 1 and 2 provide top and prospective views of a bilobal osteochondral graft of the invention respectively.
- FIG. 3 shows a drill pattern for a hole for receiving a bilobal graft such as that depicted in FIGS. 1 and 2.
- FIGS. 4 and 5 show top and prospective views of a trilobal osteochondral graft in accordance with the invention, respectively.
- FIG. 6 shows a drill pattern for creating a hole for receiving a trilobal osteochondral graft such as that depicted in FIGS. 4 and 5.
- FIGS. 7 and 8 provide top and prospective views of an osteochondral graft of the invention have four lobes, respectively.
- FIG. 9 shows a drill pattern for creating a void for receiving an osteochondral graft such as that depicted in FIGS. 7 and 8.
- FIGS. 10 and 11 depict perspective and top views of an oval-shaped osteochondral graft in accordance with the present invention.
- FIGS. 12 and 13 provide top and perspective views of a generally square-shaped osteochondral graft in accordance with the invention.
- FIGS. 14 and 15 depict osteochondral plug grafts of the invention which can be used in a nested arrangement.
- FIG. 16 provides a top view of a nested arrangement of osteochondral grafts depicted in FIGS. 14 and 15.
- FIGS. 17 through 19 depict top views of bilobal osteochondral grafts of the invention that can be used in a nested arrangement.
- FIG. 20 provides a top view of an osteochondral graft of the invention having first and second lobes and a central region connecting the lobes.
- FIG. 21 provides a top view of the graft of FIG. 20 in a nested arrangement with another similar graft.
- FIGS. 22 and 23 provide top views of osteochondral plug grafts of the invention that can be used in a mated graft assembly.
- FIG. 24 provides a top view of a mated graft assembly including the grafts depicted in FIGS. 22 and 23.
- FIGS. 24 and 25 provide top and perspective views, respectively, of an osteochondral plug graft of the invention having a cruciform cross-sectional profile.
- plug grafts such as osteochondral grafts having unique geometrical and functional characteristics as well as their use in novel grafting procedures.
- plug grafts of the invention are arranged to provide and are used in a fashion wherein mechanical interlocking features resist rotation of the grafts when implanted, and/or wherein mechanical interlocking features resist lateral separation of adjacent implanted grafts, and/or wherein nested arrangements with adjacent plug grafts are achieved.
- Osteochondral plug grafts of and for use in the invention can be harvested from the recipient or from a suitable human or other animal donor, from any appropriate structure including hyaline cartilage and underlying subchondral bone. Suitable harvest locations in large part occur in weight bearing joints of mammals, including humans. These harvest locations include, for example, articular cartilage and rib cartilage. A wide variety of articular cartilages may be used including for example those taken from articulating surfaces of the knee, hip, or shoulder joints. As specific examples, osteochondral plugs may be taken from the femoral condyle, the articulating surfaces of the knee, or the articulating surfaces of the shoulder.
- Osteochondral grafts of the invention can be harvested at their final shape for implant or can be manipulated after harvest to provide the desired shape.
- an osteochondral plug graft of the invention can have a cross sectional profile that is substantially constant or that varies along its length.
- the cartilage layer or cap can have a cross sectional profile that is the same as the profile of the underlying bone plug, while in others the cartilage cap can have a cross sectional profile that differs from that of the bone plug. The latter may occur, for instance, in grafts having a cartilage cap that extends beyond the periphery of the bone plug, or terminates short of the periphery of the bone plug.
- the bone plug itself may have a cross sectional profile that is constant along its length, or that varies along its length. Illustrative of the latter point, a cross sectional profile providing a unique, non- circular geometry as discuss herein may occur along only a portion of the bone plug, and yet provide stabilization features as described herein.
- an osteochondral plug graft for treating an articular cartilage defect includes a bone body with sidewalls having a cross-sectional profile other than a circular cylinder.
- such cross sectional profile will be that of a polygon, including equilateral and non-equilateral polygons, and regular and non-regular polygons.
- the polygon will typically having from three to about ten sides, including e.g. triangles, rectangles, pentagons, hexagons, cruciforms, etc.
- such cross sectional profile will be non-circular, but will include at least one arc of a circle (sometimes herein referred to as a "circular arc").
- cross sections include desirable embodiments wherein the cross sectional profile of the bone body is defined by multiple, intersecting circular arcs, e.g. two, three, four or more intersecting circular arcs.
- the cross sectional profile presented by sidewalls of the bone body will be ovate, or will be multi-lobed, in some embodiments having from two to four lobes.
- Osteochondral plug grafts of the invention having such shapes can be configured for receipt within surgically prepared openings in a human or other mammalian knee, hip or shoulder joint to provide a mechanically interlocked arrangement as described herein, and to be capable of withstanding the biomechanical loads typically experienced at such joints without significant occurrence of fracture of the bone body of the osteochondral plug.
- the cross-sectional profile and other physical attributes of the graft can be controlled to resist substantial fracture or break-off of the protruding segments under the ordinary loading conditions of a knee, hip, shoulder or other articular joint of a human or other mammalian patient in which the graft is to be implanted.
- allograft osteochondral plugs these can be either fresh (containing live cells) or processed and frozen or otherwise preserved to remove cells and other potentially antigenic substances while leaving behind a scaffold for patient tissue ingrowth.
- a variety of such processing techniques are known and can be used in accordance with the invention.
- harvested osteochondral plugs can be soaked in an agent that facilitates removal of cell and proteoglycan components.
- One such solution that is known includes an aqueous preparation of hyaluronidase (type IV-s, 3mg/ml), and trypsin (0.25% in monodibasic buffer 3 ml).
- the harvested osteochondral plugs can be soaked in this solution for several hours, for example 10 to 24 hours, desirably at an elevated temperature such as 37 0 C.
- a mixing method such as sonication can be used during the soak.
- Additional processing steps can include decalcification, washing with water, and immersion in organic solvent solutions such as chloroform/methanol to remove cellular debris and sterilize. After such immersion the grafts can be rinsed thoroughly with water and then frozen and optionally lyophilized.
- Osteochondral grafts of the invention can be used in the repair of articular cartilage in patients, including for example that occurring in weight bearing joints such as those noted above and especially in the knee.
- the articular cartilage in need of repair can, for example, present a full thickness defect, including damage to both the cartilage and the underlying subchondral bone. Such defects can occur due to trauma or due to advanced stages of diseases, including arthritic diseases.
- the articular cartilage site to be treated will typically be surgically prepared for receipt of the osteochondral graft.
- This preparation can include excision of patient cartilage and/or subchondral bone tissue at the site to create a hole or void in which the graft will be received.
- Tissue removal can be conducted in any suitable manner including for instance drilling and/or punching, typically in a direction substantially perpendicular to the articular cartilage layer at the site, to create a void having a depth approximating that of the graft to be implanted.
- the opening for receiving the graft will be created using a drill or punch having a circular cross-section.
- FIGS. 1 and 2 are top and perspective views, respectively, of a bilobal osteochondral graft product of the present invention.
- Graft 30 has an osteochondral structure including an underlying bone body 34 to which is attached a cartilage layer 32, desirably an articular (hyaline) cartilage layer.
- Bilobal graft 30 includes a first lobe 36 and a second lobe 38.
- Lobes 36 and 38 in the illustrated embodiment are provided as portions of right circular cylinders.
- each lobe 36, 38 provides a cross-sectional profile that includes an arc of a circle.
- the osteochondral graft 30 can thus be friction or interference fitted within an opening 40 in the patient tissue created by using a circular punch or drill to create holes 42 and 44 which overlap to an extent as shown at 46.
- the osteochondral graft 30 may not only be frictionally fit into the opening 40, but this fit will also be of a nature that provides a mechanical interlock or stop against rotation of the graft 30 within the opening 40.
- FIGS. 4 and 5 shown are top and perspective views, respectively, of another multi-lobed osteochondral graft of the present invention.
- Graft 50 also includes a cartilage layer 52 attached to an underlying bone body 54.
- Graft 50 is provided having three lobes 56, 58, and 60.
- the lobes 56, 58, and 60 are provided as longitudinal portions of right circular cylinders and thus present external surfaces and a cross-section defined by multiple, intersecting circular arcs.
- FIG. 6 shown is a drill or punch pattern to create an opening 62 having a three-dimensional profile generally corresponding to that of the external surfaces of graft 50.
- a circular punch or drill can be used to create three overlapping cylindrical bores 64, 66, and 68, to define opening 62 presenting walls of a shape corresponding to the shape of graft 50.
- graft 50 can be fit within opening 62, optionally including a friction or interference fit, and will in cooperation with opening 62 provide a mechanical interlock to resist rotation of the graft 50 within the opening 62.
- FIGS. 7 and 8 Shown in FIGS. 7 and 8 are top and perspective views of an osteochondral graft 70 of the present invention including four lobes.
- Graft 70 includes an overlying layer of cartilage 72 attached to an underlying bone body 74.
- Graft 70 includes four lobes 76, 78, 80, and 82. These lobes are provided as longitudinal sections or portions of right circular cylinders, and thus provide a cross-sectional profile defined by multiple interconnected circular arcs.
- graft 70 can be implanted within an opening 84 of corresponding shape created with four overlapping passes of an instrument that forms right cylindrical bores 86, 88, 90, and 92 such as a circular punch, drill or other suitable mechanism.
- the graft 70 so implanted in opening 84 will be mechanically interlocked against rotation.
- FIGS. 10 and 11 shown are top and perspective views of one illustrative ovate osteochondral graft 100 of the present invention.
- Graft 100 thus includes a layer of cartilage 102 attached to an underlying body of bone 104.
- Graft 100 can be implanted into a correspondingly-dimensioned ovate opening created in the patient tissue at the implant site, and will thereby be mechanically locked against rotation within the implant site. Receipt of the graft 100 within the corresponding opening can also include an interference fit if desired. It will be understood that other symmetrical or unsymmetrical ovate shapes can also be used to provide similar functions.
- FIGS . 12 and 13 show a top and perspective view of a rectangular parallelepiped- shaped osteochondral graft of the present invention.
- Graft 110 includes a generally rectangular parallelepiped-shaped body of bone 114 attached to a generally rectangular parallelepiped-shaped layer of cartilage 112. Graft 110 can be implanted into a corresponding bore created at the implant site having a rectangular cross-section to achieve a non-rotating mechanical interlock fit within the opening.
- graft 110 depicts one possible parallelepiped-shape, in that other similar graft having differing rectangular cross-sectional shapes also form a part of present invention, including among others generally cube-shaped osteochondral grafts as well as those which are more or less elongate than that depicted for graft 110.
- a square or otherwise rectangular punch can be used to create a corresponding opening in the patient tissue for receiving graft 110 in a mated fit providing the non-rotatable arrangement.
- a plurality of grafts 110 can be used to provide an advantageous graft assembly of the invention, configured for receipt within a single surgically prepared opening so as to mate with one another along one wall and substantially fill the opening. In this fashion, a close-fit between adjacent plugs can be achieved, providing better filling of the articular defect under treatment.
- FIG. 13 A shown are two graft plugs 110a and 110b mated together along one wall and received within the same, rectangular-shaped surgical opening.
- such graft assemblies include more than two graft plugs, for example from two to six plugs. In this regard, depicted in FIG.
- 13B is a graft assembly including four rectangular (square) graft plugs 110a, 110b, 110c and HOd mated together and closely packed within a single surgical opening in patient subchondral bone.
- graft plugs having cross sectional profiles other than rectangles can also be used in mated fashion in a surgical opening, wherein walls of the plugs are configured to conform to one another along an extended length when the plugs are received together within the opening.
- Such mating or conforming walls can have generally straight or curved profiles or combinations thereof, or any other suitable mating shape.
- FIGS. 14 and 15 provide top views of osteochondral graft 120 and 122 of the invention which are configured to nest with one another as implanted.
- a nested assembly 124 including graft 120 and graft 122, wherein at least one arcuate convexity or protrusion of one of the grafts (e.g. graft 122) is matingly received within a generally corresponding arcuate concavity or cut-out region of the adjacent graft (graft 120).
- Such nested arrangements can be used to provide advantageous close packing of multiple implanted osteochondral grafts to facilitate an effective fill of a larger damaged tissue region, and/or can participate in preventing rotation of one or more of the implanted, nested grafts.
- FIGS. 17 and 18 illustrate another set of osteochondral grafts which are nestable with one another.
- graft 130 presents two lobes 132 and 134 and a concave cut-out 136 presenting a generally concave surface 138.
- Osteochondral graft 140 is similar to that depicted in FIGS. 1 and 2 and thus presents a first lobe 142 and a second lobe 144.
- each graft presents external surfaces that correspond to longitudinal sections of right circular cylinders, as does their nested overall profile.
- FIG. 17 and 18 illustrate another set of osteochondral grafts which are nestable with one another.
- graft 130 presents two lobes 132 and 134 and a concave cut-out 136 presenting a generally concave surface 138.
- Osteochondral graft 140 is similar to that depicted in FIGS. 1 and 2 and thus presents a first lobe 142 and a second lobe
- graft 140 is shown partially nested within graft 130, with a portion of lobe 142 of graft 140 received within concavity 136 and abutted against concave surface 138.
- the nested configuration shown in FIG. 19 can be inserted into a corresponding unitary opening created in the patient tissue using a series of right cylindrical bores made in an overlapping pattern.
- the assembled graft shown in FIG. 19 both nests and provides a mechanical interlock against rotation when implanted.
- Graft 150 includes a first lobe 152 and a second lobe 154 presenting exterior surfaces 156 and 158 consistent with those of circular cylinders.
- Lobes 152 and 154 are interconnected by a central portion 160 which presents a generally concave surface on each side.
- a number of grafts 150 can be nested together as implanted to provide a nested assembly 160.
- An opening of corresponding shape can be created in the patient tissue to receive the nested assembly 160 using a punch having a shape corresponding to the exterior shape of graft 150, or using a drill or other device manipulable to create an opening of the appropriate size and shape.
- FIGS. 22-24 illustrate additional osteochondral grafts and assemblies of the invention, which are configured to mechanically interlock with one another to resist lateral separation, e.g. by providing a interleaved joint (e.g. as provided in a dovetail or other similar undercut arrangement) between portions of the grafts.
- osteochondral graft 170 is provided generally as right circular cylinder having a dovetail cut-out 172 extending longitudinally therein.
- Dovetail cut-out 172 presents a series of inner walls 174 for receiving and mechanically restraining a corresponding dovetail protrusion.
- Graft 170 presents an arcuate outer wall 176 consistent with that of a circular cylinder, for receipt within a corresponding cylinder bore at the implant site.
- Osteochondral graft 178 (FIG. 23) includes a generally circular cylindrical portion 182 and a dovetail-shaped protrusion 180 extending along its length. In this manner, as shown in FIG. 24, grafts 170 and 178 can be implanted together in an interleaved fashion forming a dovetail joint between the two, whereby they are mechanically together against lateral separation.
- the interleaved assembly 184 can be implanted within an opening in the patient tissue of a corresponding shape, which in turn can be created as overlapping circular bores using conventional drills, punches or other equipment for creating the same. It will be understood that the assembly 184 depicts one illustrative embodiment of interleaved, mechanically locked grafts, and that many other arrangements which provide for interleaving portions of adjacent grafts so as to provide locking or resistance to lateral separation and/or rotation can be used within the spirit and scope of the present invention.
- FIGS. 25 and 26 provide top and perspective views, respectively, of a cruciform osteochondral plug graft 190 of the present invention.
- Graft 190 includes a cartilage layer 192 attached to an underlying bone body 194, and have a cross sectional profile defined by four generally rectangular projecting segments 196, 198, 200 and 202, forming an overall cruciform or cross-shaped profile.
- Graft 190 can be implanted into a corresponding bore created at the implant site having a cruciform cross-section to achieve a non-rotating mechanical interlock fit within the opening.
- Such an opening can be surgically prepared for example using a correspondingly-shaped punch, or using multiple overlapping passes of an appropriately rectangular punch.
- plug grafts of and for use in the invention can be manufactured from other materials or components.
- plug grafts adapted for receipt in surgical openings in subchondral bone at articular sites, and desirably for integration with the subchondral bone can be synthesized from natural or synthetic materials.
- plug bodies can be synthesized from biopolymers or from synthetic polymers (bioabsorbable and non-bioabsorbable synthetic polymers), ceramics, or combinations thereof.
- Illustrative synthetic bioabsorbable, biocompatible polymers, which may act as suitable matrices for plug bodies can include poly-alpha- hydroxy acids (e.
- polylactides such as lactic acid/glycolic acid copolymers and lactic acid/caprolactone copolymers
- polyanhydrides such as lactic acid/glycolic acid copolymers and lactic acid/caprolactone copolymers
- polyanhydrides such as lactic acid/glycolic acid copolymers and lactic acid/caprolactone copolymers
- polyorthoesters such as polydioxanone
- tyrosine derivative polymers such as tyrosine- derived polycarbonates, or poly (ester-amides).
- Suitable ceramic materials include, for example, calcium phosphate ceramics such as tricalcium phosphate, hydroxyapatite, and biphasic calcium phosphate. These or other suitable materials can be used to form plug grafts useful in articular cartilage resurfacing procedures.
- such grafts may have a uniform composition throughout, or may vary, for instance having a plug body formed of a first, relatively strong and loadbearing material (e.g. a ceramic, polymer or composite), and a cap formed of another material to provide the articulating surface formed by another material, for example a relatively smooth polymer layer.
- a first, relatively strong and loadbearing material e.g. a ceramic, polymer or composite
- Plug grafts of the invention can be used in conjunction with other materials helpful to the treatment.
- the grafts can be used in combination with a growth factor, and especially a growth factor that is effective in inducing formation of bone and/or cartilage tissue.
- the growth factor will be from a class of proteins known generally as bone morphogenic proteins (BMPs), and can in certain embodiments be recombinant human (rh) BMPs.
- BMPs bone morphogenic proteins
- rh recombinant human
- BMP proteins which are known to have osteogenic, chondrogenic and other growth and differentiation activities, include rhBMP- 2, rhBMP-3, rhBMP4 (also referred to as rhBMP-2B), rhBMP-5, rhBMP-6, rhBMP-7 (rhOP-1), rhBMP-8, rhBMP-9, rhBMP-12, rhBMP-13, rhBMP-15, rhBMP-16, rhBMP-17, rhBMP-18, rhGDF-1, rhGDF-3, rhGDF-5, rhGDF-6, rhGDF-7, rhGDF-8, rhGDF-9, rhGDF-10, rhGDF-11 3 rhGDF-12, rhGDF-14.
- BMP-2, BMP-3, BMP-4, BMP-5, BMP-6 and BMP-7 disclosed in U.S. Pat. Nos. 5,108,922; 5,013,649; 5,116,738; 5,106,748; 5,187,076; and 5,141,905; BMP-8, disclosed in PCT publication WO91/18098; and BMP-9, disclosed in PCT publication WO93/00432, BMP-10, disclosed in U.S. Pat. No. 5,637,480; BMP-11, disclosed in U.S. Pat. No. 5,639,638, or BMP-12 or BMP-13, disclosed in U.S. Pat. No. 5,658,882, BMP-15, disclosed U.S. Pat. No.
- compositions which may also be useful include Vgr-2, and any of the growth and differentiation factors [GDFs], including those described in PCT applications WO94/15965; WO94/15949; WO95/01801; WO95/01802; WO94/21681; WO94/15966; WO95/10539; WO96/01845; WO96/02559 and others.
- GDFs growth and differentiation factors
- Also useful in the present invention may be BIP, disclosed in WO94/01557; HP00269, disclosed in JP Publication number: 7-250688; and MP52, disclosed in PCT application WO93/16099.
- heterodimers of the above and modified proteins or partial deletion products thereof are also useful in the present invention. These proteins can be used individually or in mixtures of two or more. rhBMP-2 is preferred.
- the BMP may be recombinantly produced, or purified from a protein composition.
- the BMP may be homodimeric, or may be heterodimeric with other BMPs (e.g., a heterodimer composed of one monomer each of BMP-2 and BMP-6) or with other members of the TGF-beta superfamily, such as activins, inhibins and TGF-beta 1 (e.g., a heterodimer composed of one monomer each of a BMP and a related member of the TGF- beta superfamily).
- BMPs e.g., a heterodimer composed of one monomer each of BMP-2 and BMP-6
- other members of the TGF-beta superfamily such as activins, inhibins and TGF-beta 1
- TGF-beta 1 e.g., a heterodimer composed of one monomer each of a BMP and a related member of the TGF- beta superfamily
- the amount of osteogenic protein useful herein is that amount effective to stimulate increased osteogenic activity of infiltrating progenitor cells, and will depend upon several factors including the size and nature of the defect being treated, and the carrier and particular protein being employed. In certain embodiments, the amount of osteogenic protein to be delivered will be in a range of from about 0.05 to about 1.5 mg.
- An osteogenic protein used to form bone can also be administered together with an effective amount of a protein which is able to induce the formation of tendon- or ligament- like tissue in the implant environment.
- a protein which is able to induce the formation of tendon- or ligament- like tissue in the implant environment.
- Such proteins include BMP- 12, BMP-13, and other members of the BMP-12 subfamily, as well as MP52. These proteins and their use for regeneration of tendon and ligament-like tissue are disclosed for example in U.S. Patent Nos. 5,658,882, 6,187,742, 6,284,872 and 6,719,968 the disclosures of which are hereby incorporated herein by reference.
- Growth factor may be applied to the tissue source in the form of a buffered aqueous solution.
- Other materials which may be suitable for use in application of the growth factors in the methods and products of the present invention include carrier materials such as collagen, milled cartilage, hyaluronic acid, polyglyconate, degradable synthetic polymers, demineralized bone, minerals and ceramics, such as calcium phosphates, hydroxyapatite, etc., as well as combinations of these and potentially other materials.
- carrier materials such as collagen, milled cartilage, hyaluronic acid, polyglyconate, degradable synthetic polymers, demineralized bone, minerals and ceramics, such as calcium phosphates, hydroxyapatite, etc., as well as combinations of these and potentially other materials.
- Other biologically active materials may also be used in conjunction with osteochondral grafts of the present invention.
- cells such as human allogenic or autologous chondrocytes, human allogenic cells, human allogenic or autologous bone marrow cells, human allogenic or autologous stem cells, demineralized bone matrix, insulin, insulin-like growth factor- 1, interleukin-1 receptor antagonist, hepatocyte growth factor, platelet-derived growth factor, and Indian hedgehog and parathyroid hormone- related peptide, to name a few.
- suitable organic glue material can be used to help secure the graft in place in the implant area.
- Suitable organic glue material can be obtained commercially, such as for example; TIS SEEL® or TISSUCOL® (fibrin based adhesive; Immuno AG, Austria), Adhesive Protein (Sigma Chemical, USA), Dow Corning Medical Adhesive B (Dow Corning, USA), fibrinogen thrombin, elastin, collagen, casein, albumin, keratin and the like.
- the growth factor and/or other material(s) can be applied directly to the plug graft and/or to the site in need of repair.
- the growth factor and/or other material may be physically applied to the graft (e.g. the bone and/or cartilage tissue of an osteochondral graft) through spraying or dipping, or using a brash or other suitable applicator, such as a syringe.
- amounts of the growth factor or other material(s) can be directly applied to the site in need of tissue repair, for example by filling or coating the surgically-prepared opening with one or more of these substances.
- Osteochondral plug grafts and grafting methods of the present invention can be used in certain aspects of the invention to provide improved implant stabilization, more rapid or complete incorporation of the graft into patient tissue, and/or an enhanced ability to restore articular cartilage defects.
- the use of circular cross section graft plugs in adjacent, separate surgical openings leaves gaps between grafts, which can present a relatively non-uniform articulating surface and can also provide pathways for the migration of synovial fluids into the subchondral bone, which may impair graft integration or otherwise deleteriously affect patient outcome.
- grafts having non-circular cross section can be used adjacent to one another, including in the same surgical opening, in a fashion that leaves fewer or smaller gaps in the resurfaced area and enhances the grafting procedure.
- these particular enhanced features can be provided in certain inventive aspects, they are not required in all embodiments or broader features of the present invention.
- the use of the word preferable, preferably or preferred in the description above indicates that the feature so described may be more desirable, it nonetheless may not be necessary and embodiments lacking the same may be contemplated as within the scope of the invention, that scope being defined by the claims that follow.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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JP2008509218A JP2008539814A (en) | 2005-04-30 | 2006-05-01 | Molded osteochondral graft |
CA002605719A CA2605719A1 (en) | 2005-04-30 | 2006-05-01 | Shaped osteochondral grafts and methods of using same |
CN2006800146897A CN101166485B (en) | 2005-04-30 | 2006-05-01 | Shaped osteochondral grafts and methods of using same |
AU2006242360A AU2006242360A1 (en) | 2005-04-30 | 2006-05-01 | Shaped osteochondral grafts and methods of using same |
EP06758801A EP1885292A2 (en) | 2005-04-30 | 2006-05-01 | Shaped osteochondral grafts and methods of using same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US11/120,136 US20060247790A1 (en) | 2005-04-30 | 2005-04-30 | Shaped osteochondral grafts and methods of using same |
US11/120,136 | 2005-04-30 |
Publications (2)
Publication Number | Publication Date |
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WO2006119126A2 true WO2006119126A2 (en) | 2006-11-09 |
WO2006119126A3 WO2006119126A3 (en) | 2007-04-12 |
Family
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PCT/US2006/016491 WO2006119126A2 (en) | 2005-04-30 | 2006-05-01 | Shaped osteochondral grafts and methods of using same |
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US (1) | US20060247790A1 (en) |
EP (1) | EP1885292A2 (en) |
JP (1) | JP2008539814A (en) |
CN (1) | CN101166485B (en) |
AU (1) | AU2006242360A1 (en) |
CA (1) | CA2605719A1 (en) |
WO (1) | WO2006119126A2 (en) |
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Also Published As
Publication number | Publication date |
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EP1885292A2 (en) | 2008-02-13 |
CA2605719A1 (en) | 2006-11-09 |
US20060247790A1 (en) | 2006-11-02 |
CN101166485A (en) | 2008-04-23 |
CN101166485B (en) | 2010-12-08 |
AU2006242360A1 (en) | 2006-11-09 |
WO2006119126A3 (en) | 2007-04-12 |
JP2008539814A (en) | 2008-11-20 |
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