Patent ID: 7591855

Claim:
A knee prosthesis system, comprising: a femoral component comprising runners; a tibial component comprising a tibial plateau that is rotationally fixed relative to the tibial component, the runners being arranged to load-bearingly engage the tibial plateau; a first intermediate piece configured to connect the femoral component and the tibial component forming a flexion bearing with the femoral component and a rotation bearing with the tibial component, allowing the runners to rotate relative to the tibial plateau; and a second intermediate piece configured to connect the femoral component and the tibial component forming a flexion bearing with the femoral component and fully block rotation between the femoral component and the tibial component, blocking the runners from rotating relative to the tibial plateau; wherein the knee prosthesis system is configured to use either the first intermediate piece or the second intermediate piece to connect the femoral component and the tibial compoment.