Femoral component for a knee prosthesis with improved articular characteristics

A posterior-stabilized femoral component adapted to articulate with a tibial bearing component in a knee prosthesis, the tibial bearing component including a proximally extending spine, the femoral component comprising:

• medial and lateral condyles shaped to articulate with the tibial bearing component through a range of motion, in which full extension corresponds to zero degrees flexion of the knee prosthesis and positive flexion corresponds to greater than zero degrees flexion of the knee prosthesis,
• said medial and lateral condyles comprising inwardly facing condylar walls forming an intercondylar space therebetween, said intercondylar space having a medial/lateral width;
• and
• a femoral cam sized and positioned to engage the spine of the tibial bearing component in positive flexion through a portion of the range of motion, said femoral cam comprising a medial/lateral cam length spanning said intercondylar space such that said femoral cam joins said medial and lateral condyles to one another,
• said femoral cam having an articular surface comprising:
• a central articular surface;
• a convex medial transition surface flanking said central articular surface and disposed between said central articular surface and said medial condyle;
• and
• a convex lateral transition surface flanking said central articular surface and disposed between said central articular surface and said lateral condyle,
• said convex medial transition surface and said convex lateral transition surface each defining an arc extending in a medial/lateral direction, said arc defining a radius in a coronal cross-section of the femoral cam equal to between 6-12 mm.