Patent ID: 7871442

Claim:
A knee prosthesis for implanting in a knee joint including a femur and a tibia, the tibia having a longitudinal axis, the prosthesis comprising: a femoral component defining a fixed axis of rotation; a tibial component defining a hole and having a proximal-distal axis substantially parallel to the longitudinal axis of the tibia; and a hinge assembly including a hinge rod and a pin connecting the femoral component and the tibial component, the hinge rod having a circular opening adapted to allow the pin to pass therethrough, the hinge rod adapted to slide in the hole of the tibial component, the hinge assembly defining a hinge axis that is transverse to the proximal-distal axis of the tibial component, wherein the femoral component rotates about the hinge axis, and the hinge axis moves substantially along an axis substantially parallel to the proximal-distal axis of the tibial component upon flexion of the knee joint.