Paragraph Number

138

The present disclosure includes embodiments for which the tibial articulation surface 2812 is contoured to position a longitudinal axis of tibiofemoral rotation within a desired or engineered compartment of the tibial articulation surface 2812. Generally, the more constraint a tibial articulation surface 2412,2812 imparts on a condyle of the femoral component, the more rotation about an axis within that area of the tibial articulation surface 2412,2812. For example, to position the longitudinal axis 2446 within the medial articulation surface 2420 of the tibial articulation surface 2412, the medial articulation surface 2420 is contoured to impose more constraint on the medial condylar articulation surface 2404 of the medial condyle 2402 than the lateral articulation surface 2421. Similarly, to position the longitudinal axis 2846 within the lateral articulation surface 2821 of the tibial articulation surface 2812, the lateral articulation surface 2821 is contoured to impose more constraint on the lateral condylar articulation surface 2805 of the lateral condyle 2803 than the medial articulation surface 2820.

Added by DJM 1 2022