STABILIZED PROSTHETIC KNEE

摘要

A semi-constrained prosthetic knee (10) for sur- gical replacement of a dysfunctional knee includes a tibial platform (22), a movable bearing element (16), and a femoral component (12). The femoral and tibial components are typically constructed of a cobalt/chromium alloy and each includes am exten- sion for securing the component to the bone. The femoral component includes a polycentric convex bear- ing which slidably engages a movable bearing, typi- cally constructed of high molecular weight polyethyl- ene. The superior surface of the bearing element is designed to congruently slidably engage the inferior surface of the bearing portion of the femoral com- ponent throughout the flexion/extension range of the knee. The inferior surface of the femoral component is generally convex with two or more offset portions of varying radii of curvature matching complementary superior surfaces of the bearing element. The superior surface of the tibial platform is generally flat and in- cludes at least one protrusion for controlling the move- ment of the bearing element.