Patent ID: 7731755

Claim:
A posterior stabilized mobile bearing knee prosthesis, comprising: a femoral component having a medial condyle surface and a lateral condyle surface, a tibial tray having a platform with an elongated stem extending therefrom, the platform has an upper surface which mates with a downwardly extending anterior surface along an anterior edge, and a bearing positioned on the platform, the bearing having (i) a medial bearing surface configured to articulate with the medial condyle surface of the femoral component, (ii) a lateral bearing surface configured to articulate with the lateral condyle surface of the femoral component, (iii) a stem integrally formed with the bearing, the stem being received within a complementary bore in the tibial tray, and (iv) a spine integrally formed with the bearing, the spine being received within a notch in the femoral component, wherein the spine of the bearing contacts the femoral component such that at 120° of flexion, when viewed in a side elevational view, the anterior-most point of the bearing is positioned posteriorly of an imaginary line that is tangent to at least one of the medial condyle surface and the lateral condyle surface of the femoral component and intersecting a point on the anterior edge of the platform of the tibial tray.