Knee prosthesis
First Claim
1. A knee prosthesis comprising a femoral component for securement to the femur, the femoral component defining medial and lateral condyles and an intercondylar groove, a tibial component for securement to the tibia, and a bearing component between the femoral and tibial components, the bearing component having respective surfaces shaped to match said condyles and engaging therewith when the knee, in use, is extended and also over a range of flexion, the condyles being in the form of respective parts of a common helix and the respective matching surfaces of the bearing component being correspondingly part-helical.
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Abstract
A knee prosthesis comprises a femoral component, a tibial component and a bearing component therebetween. The femoral component defines medial and lateral condylar surfaces which are in the form of respective parts of a common helix, and the bearing component has respective surfaces matching the condylar surfaces. Accordingly a patella groove in the femoral component is laterally displaced, and on flexion of the knee, in use, from an extended position there is a lateral translatory movement of the femur. Congruent contact between the femoral component and the bearing component is maintained through at least 60° of flexion of the knee from an extended position.
82 Citations
9 Claims
- 1. A knee prosthesis comprising a femoral component for securement to the femur, the femoral component defining medial and lateral condyles and an intercondylar groove, a tibial component for securement to the tibia, and a bearing component between the femoral and tibial components, the bearing component having respective surfaces shaped to match said condyles and engaging therewith when the knee, in use, is extended and also over a range of flexion, the condyles being in the form of respective parts of a common helix and the respective matching surfaces of the bearing component being correspondingly part-helical.
Specification