Posterior stabilized orthopaedic prosthesis assembly

摘要

A posterior stabilized knee orthopaedic prosthesis assembly includes a tibial bearing, a primary femoral component, and a revision femoral component. Each of the primary and revision femoral components is configured to separately articulate with the tibial bearing. However, each of the primary and revision femoral components has different geometry. The primary femoral component includes a posterior cam having a posterior cam surfacing including a concave cam surface and a convex cam surface. The revision femoral component includes a posterior cam having only a convex cam surface.

主权项

1. An orthopaedic prosthesis assembly comprising:
a tibial bearing configured to be coupled to a tibial tray, the tibial bearing having a platform and a spine extending upwardly from the platform, the spine having a posterior cam surface, the posterior cam surface including a concave cam surface and a convex cam surface: and a first femoral component and a second femoral component, each of the first and second femoral components being configured to separately couple with the tibial bearing to articulate with the tibial bearing and including (i) a pair of spaced apart condyles defining an intracondylar notch therebetween and (ii) a posterior cam positioned in the intracondylar notch, the posterior cam including a posterior cam surface, wherein the first femoral component includes an anterior surface positioned at an anterior end of the intracondylar notch such that the intracondylar notch includes an opening defined between the posterior cam and the anterior surface, and the posterior cam surface of the first femoral component includes a concave cam surface and a convex cam surface, the concave cam surface of the posterior cam being configured to initially contact the convex cam surface of the spine during a first range of flexion and the convex cam surface of the posterior cam being configured to initially contact the concave cam surface of the spine during a second range of flexion that is greater than the first range of flexion, wherein the second femoral component includes an anterior cam that is connected to the posterior cam, and the posterior cam surface of the second femoral component is uniformly convex in the sagittal plane, wherein the concave cam surface of the posterior cam surface of the first femoral component is concavely curved in the sagittal plane and the convex cam surface of the posterior cam surface of the first femoral component is convexly curved in the sagittal plane, and wherein the first femoral component is a primary femoral component and the second femoral component is a revision femoral component.