Tibial knee prosthesis

A knee prosthetic for facilitating movement of a knee through a large range of knee flexion angles, including high knee flexion, said knee prosthetic comprising:

• a femoral component having a medial condyle and a lateral condyle;
• and
• a tibial component defining a medial concavity and a lateral concavity;
• wherein the lateral concavity has a different shape than the medial concavity;
• wherein said medial and lateral concavities have first portions that are in articulating contact with the medial and lateral condyles of the femoral component during normal knee flexion;
• wherein said medial and lateral concavities have second portions that are at least partially separate from the first portions and are in articulating contact with the medial and lateral condyles of the femoral component during high knee flexion;
• and
• said medial concavity including a conforming boundary, an area within the conforming boundary having a generally flat surface, the conforming boundary having a generally triangular shape with an apex at the anterior end and a base at the posterior end.

A prosthetic for facilitating articulating contact of a tibia with a femur of a knee, said femur having a medial condyle and a lateral condyle, said knee prosthetic comprising:

• a tibial component defining a lateral concavity and a medial concavity;
• said lateral concavity having a first portion configured to interact with the lateral condyle of the femur during normal knee flexion and a second portion configured to interact with the lateral condyle of the femur during high knee flexion;
• and
• said medial concavity having a first portion configured to interact with the medial condyle of the femur during normal knee flexion and a second portion configured to interact with the medial condyle of the femur during high knee flexion, said medial concavity having a generally triangular portion, said generally triangular portior having a generally flat contour, a peak of said generally triangular portion positioned anteriorly of a base of said generally triangular portion, and said generally triangular portion positioned to facilitate posterior and lateral translation of an articulation pivot point with the medial condyle of the femur during high knee flexion.