Tibial prosthesis with asymmetric articular surfaces

In a tibial prosthesis having tibial articular surfaces extending between an anterior edge of the tibial prosthesis and a posterior edge of the tibial prosthesis, the tibial articular surfaces including a medial articular surface in a medial compartment and a lateral articular surface in a lateral compartment, an improvement wherein:

• the medial articular surface follows a first arcuate track having a first radius of curvature and a first posterior segment extending along a posterior aspect of the medial compartment to a first point located adjacent the posterior edge of the tibial prosthesis at a first inferior-superior location;
• and
• the lateral articular surface follows a second arcuate track having a second radius of curvature and a second posterior segment extending along a posterior aspect of the lateral compartment to a second point located adjacent the posterior edge of the tibial prosthesis at a second superior-inferior location;
• the second posterior segment having a slope extending in an inferior direction along the posterior aspect of the lateral compartment such that the second superior-inferior location is spaced a predetermined distance in an inferior direction from the first superior-inferior location.