PROSTHETIC KNEE TIBIAL COMPONENT WITH AXIALLY RIBBED KEEL AND APPARATUS FOR EFFECTING IMPLANT
 Inventors: Robert C. Cohen, Rockaway
Township, Morris County; Robert G.
Averill, Ringwood; Scott V. Cron,
Rahway, all of N.J.
 Assignee: Osteonics Corp., Allendale, N.J.
 Appl. No.: 151,983
 Filed: Nov. 15,1993
Related U.S. Application Data
 Division of Ser. No. 834,675, Feb. 12, 1992, Pat. No. 5,282,866.
 Int. CU A61F 5/04
 U.S. CI 606/88; 606/86;
 Field of Search 623/6; 606/79, 80, 86,
606/87, 88, 96
 References Cited
U.S. PATENT DOCUMENTS
5,163,940 11/1992 Bourgue 606/88
Primary Examiner—Randy C. Shay
[ii] Patent Number: 5,356,414  Date of Patent: Oct. 18, 1994
Attorney, Agent, or Firm—Samuelson & Jacob
A tibial component of a prosthetic knee implant has a tibial tray, a post extending axially downwardly from a generally laterally central location beneath the tibial tray, and a keel including flanges extending laterally outwardly from the post and making an angle with one another so as to be directed toward relatively denser portions of the bone of the proximal tibia, and a plurality of ribs extending axially along each flange and spaced laterally from one another along the flange for enhancing the affixation and stability of the tibial component when implanted in the proximal tibia. Apparatus for preparing the proximal tibia for the reception of the tibial component includes a tibial punch and a tower selectively located at the proximal tibia, the tower having an axially extending guide bushing for placement above the proximal tibia and a channel extending laterally into the guide bushing for enabling the tibial punch to be inserted laterally into the guide bushing and then moved axially downwardly into the proximal tibia, while guided by the guide bushing, to establish a cavity in the proximal tibia for reception of the tibial component.
5 Claims, 6 Drawing Sheets