KNEE PROSTHESIS

摘要

A knee prosthesis having a femoral component (200) with two condyles (201,202), an opening (205) disposed between the two condyles, and a tibial component (100) having bearing surfaces (101,102) to engage and support each of the femoral component condyles. Moving the femoral and tibial components in flexion from about 0° to about 165° causes medial pivot rotation of the femoral component upon the tibial component. Rotation may be caused by interaction between an asymmetrical cam (210) extending between the femoral condyles and a post (110) disposed between the bearing surfaces and extending superior from the tibial component. Rotation may alternatively be caused by asymmetrical medial and lateral condyles which translate posteriorly upon respective medial and lateral bearing surfaces at disparate rates, without a femoral cam, a tibial post, or a post/cam contact surface. Embodiments of the knee prosthesis may be used in cruciate-substituting or cruciate- retaining procedures. Embodiments of the knee prosthesis may also prevent roll forward.