Asymmetric femoral prosthesis

Abstract

A knee prosthesis includes a femoral prosthesis member having anterior, distal, and posterior articulating surface portions. The posterior articulating surface portions comprising a pair of condylar surface portions that are positioned at differing distances from the anterior non-articulating surface plane. The posterolateral articulating surface is a greater distance away from the anterior non-articulating surface than the posteromedial articulating surface. The femoral prosthesis has a non-articulating surface that includes a plurality of intersecting surfaces including at least distal, anterior, and posterior surfaces for receiving the patient's distal femur after it has been surgically prepared. A patella component having an articulating surface which articulates with the anterior articulating surface of the femoral component cooperates with a patella groove in the femoral component. The groove has a longitudinal axis which is located laterally with respect to the centerline of the superior region of the anterior articulating surface of the femoral component and which curves in a medial direction in the distal region of the anterior articulating surface of the femoral component. The angle of femoral rotation generally about the mechanical axis generally changes when going through a normal range of motion of the patient's knee while maintaining alignment of the femoral and tibial articular surfaces.

Dependencies are inferred from the claim text.