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A typical knee prosthesis system includes a tibial bone anchoring component, a tibial articulating component, which may be called a tibial insert, and a femoral bone anchoring component. Certain patients have experience different conditions in one knee or both knees that differ from accepted healthy knees. For example, one patient may present a right side knee that is in a varus condition while another patient may present with a right side knee in a valgus condition. Of course, other patients may present with a left knee or both knees in one or more of a varus and/or a valgus condition. For such patients, implanting a conventional knee prosthesis may result in a knee joint having constrained tibiofemoral rotation during flexion. Or, implanting a conventional knee prosthesis may result in a knee joint having less mediolateral stability during flexion.

Added by DJM 1 2022