An artificial knee joint is described that includes a femoral component with a specially shaped bearing surface and a tibial component, whose surface interacts with the femoral surfaces. The interaction provides for the required motion and stability characteristics. The interaction between the femoral and tibial surfaces is such that as the knee is flexed to maximum, the femoral component moves posteriorly on the tibial surface, by an amount similar to that in the anatomic knee. The opposite motion, roll forward of the femur from a fully flexed to a more extended position, is accomplished by varying the outward radii of the lateral and medial femoral bearing surfaces, together with a ramp on the postero-lateral and postero-medial regions of the tibial surfaces.

 
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< Intervertebral Disc Nucleus Implants and Methods

> KNEE PROSTHESIS SYSTEM WITH AT LEAST A FIRST TIBIAL PORTION ELEMENT (A TIBIAL INSERT OR TIBIAL TRIAL) AND A SECOND TIBIAL PORTION ELEMENT (A TIBIAL INSERT OR TIBIAL TRIAL), WHEREIN EACH OF THE FIRST TIBIAL PORTION ELEMENT AND THE SECOND TIBIAL PORTION ELEMENT HAS A DIFFERENT SLOPE

> KINEMATIC TOTAL WRIST ARTHROPLASTY

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