Tibial component for a replacement knee prosthesis

• US 5,080,675 A
• Filed: 03/05/1991
• Issued: 01/14/1992
• Est. Priority Date: 03/12/1990
• Status: Expired due to Fees

• Current Assignee: Howmedica International S. De R.L. (Stryker Corporation)
• Original Assignee: Akiho Hoshino, Alan M. Ashby, Maurilio Marcacci, Peter Lawes, Pier G. Marchetti, William A. Wallace
• Inventors: Marcacci, Maurilio, Lawes, Peter, Ashby, Alan M., Marchetti, Pier G., Wallace, William A., Hoshino, Akiho
• Primary Examiner(s): Frinks, Ronald
• Application Number:
  US07/664,710
• Time in Patent Office: 315 Days
• Field of Search: 623/20, 623/18, 623/16
• US Class Current: 623/20.33
• CPC Class Codes: A61F 2/3868 with sliding tibial bearing
• CPC Class Codes: A61F 2002/30563 having elastic means or damping means, different from springs, e.g. including an elastomeric core or shock absorbers

Abstract

A tibial component for a replacement knee prosthesis comprising a tibial tray for connection to a suitably prepared tibia has a tray carrying fixed lateral and medial condylar bearing components. Only the medial component has a shock absorber located beneath it.

Claims

1. A tibial component for a replacement knee prosthesis comprising a tibial tray for connection to a suitably prepared tibia, said tray carrying fixed lateral and medial condylar bearing components, only said medial component having a shock absorber located beneath it.

2. The tibial component for a replacement knee prosthesis as claimed in claim 1 in which a stiffening element is provided between the shock absorber and the fixed medial bearing component.

3. A tibial component for a replacement knee prosthesis comprising a tibial tray for connection to a suitably prepared tibia, said tray carrying a fixed medial condylar bearing component and a movable lateral meniscal bearing component which can slide with anterior and posterior movement in relation to said tray.

4. The tibial component for a replacement knee prosthesis as claimed in claim 3 in which medial or lateral movement of said movable lateral bearing component is allowed in plane rotation relative to said tray.

5. The tibial component for a replacement knee prosthesis as claimed in claim 3 in which said fixed medial bearing component is provided with a shock absorber beneath it.

6. The tibial component for a replacement knee prosthesis as claimed in claim 5 in which a stiffening element is provided between the shock absorber and the medial bearing component.

7. The tibial component for a replacement knee prosthesis as claimed in claim 6 in which said movable lateral meniscal bearing component is provided with a shock absorber beneath it.

8. The tibial component for a replacement knee prosthesis as claimed in claim 7 in which a stiffening element is provided between the shock absorber and the movable lateral meniscal bearing component