Patent ID: 8512413

Claim:
A prosthetic knee joint, comprising: (a) a femoral member comprising a rigid material and having a convex-curved, wear-resistant femoral contact surface, the femoral contact surface including two spaced-apart protruding ridges having a convex cross-sectional shape; and (b) a tibial assembly including: (i) two independent and separated cups, each comprising a rigid material and having a body and a rim extending around an open periphery of the body, the rim being thicker than the body and defining a wear-resistant cup contact surface, wherein the rim has an elevational profile shape which is elevated at distal ends thereof, and lower in a middle thereof, relative to the body; (ii) a rigid base; and (iii) two separate spaced-apart spring supports, each spring support independently interconnecting at least part of a respective cup to the base, wherein each spring support is elastically deflectable so as to permit controlled pivoting motion of the respective cup relative to the base; (c) wherein each of the cup contact surfaces bears directly against the femoral contact surface, so as to transfer axial and lateral loads between the tibial assembly and the femoral member, while allowing pivoting motion between the tibial assembly and the femoral member.