IMPROVED FLOATING BEARING PROSTHETIC KNEE

摘要

A semiconstrained prosthetic knee for surgical replacement of a dysfunctional knee includes a tibial platform (22), a movable bearing element (16), and a femoral component (12). The femoral component (12) includes a polycentric convex bearing which slidably engages a movable bearing (16). The superior surface of the bearing element (16) is designed to congruently slidably engage the inferior surface of the bearing portion of the femoral component (12). The inferior surface of the femoral component (12) is generally convex with two or more offset portions of varying radii of curvature matching complementary superior surfaces of the bearing element (16). The inferior surface of the femoral component (12) may have more than one radius of curvature at different points along the convex surface. The superior surface of the tibial platform (22) is generally flat and includes at least one protrusion for controlling the movement of the bearing element (16).