Abstract: A joint prosthesis including a first element comprising a joint bearing surface and a second element which has an integral stem and body portion. The body includes a collar having a male taper outer surface configured to engage a complementary female taper surface formed in the joint bearing surface of the first element. Engagement of the female taper on the male taper provides the sole mechanical connection between the joint bearing member and the stem body element. The invention includes a kit for assembly of a modular joint prosthesis, the kit includes at least two stem body elements and at least two joint bearing members.

Abstract: An alignment guide for positioning a saw guide at a predetermined position on the distal femur is placed on the femur and receives an intramedullary rod inserted in the femur. The guide has an arm for coupling the saw guide block. The guide includes an intercondylar saddle that engages the intercondylar notch of the femur to align the saw guide at a predetermined position proximal to the intercondylar notch.