Patent ID: 9452054
Filing Date: 2016-09-27
CPC Classification: A61F

Claim Text:
1. A knee prosthesis comprising: a femoral component having at one end a pair of laterally spaced condylar formations; and a tibial component having a transverse platform supporting a shock absorbing bumper interposed between the platform and condylar formations with the tibial component supporting a ball of a ball and socket joint, the ball fixed in its axial position relative to the tibial component, and whereof the socket is held captive by the femoral component, wherein the socket is provided in a generally cylindrical bearing having an axis extending generally parallel to a longitudinal axis of the femoral component with the bearing being held captive in a recess that is between the two laterally spaced condylar formations and is formed in the region of said end of the femoral component, and wherein a suitably rigid bearing support collar engages the bearing to hold it captive in its position in the recess in the femoral component and the hearing is held captive in the recess by at least two oppositely and inwardly directed screw threaded fasteners received in screw-threaded passages in tubular formations that are integral with the femoral component with the screw threaded fasteners engaging the bearing support collar such that, in operation, movement of a knee is achieved by the combined control of the femoral bearing assembly and the bumper carried by the tibial component with freedom of movement of the knee being restricted by an articulating surface on the bumper, which allows the femoral component to flex in the anterior posterior direction.