Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1988-02-03
1990-07-31
Apley, Richard J.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
A61F 238
Patent
active
049447564
ABSTRACT:
A three-component knee joint prosthesis is disclosed including femoral, tibial and patellar components. During flexion of the prosthetic knee, the patellar component, which has a convex bearing surface, cooperates with and is guided by a patellar track defined by the anterior plate portion, lateral condylar bearing portion and medial condylar bearing portion of the femoral component and a web portion joining the two femoral condylar bearing portions. The inner regions of the two femoral condylar bearing portions are steeply sloped towards the web portion to permit the patellar component to "ride deeply" upon the femoral component at high degrees of flexion, thereby reducing quadriceps tension and expanding the permissible range of motion in flexion.
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patent: 4479271 (1984-10-01), Bolesky et al.
patent: 4714472 (1987-12-01), Averill et al.
The P.C.A. Primary Total Knee System, A Brochure by Howmedica Inc., 8-1986, pp. 1-7.
Akers Lawrence C.
Apley Richard J.
Crosby David F.
Pfizer Hospital Products Group
Richardson Peter C.
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