Orthopaedic implant having an articulating surface with a conforming area surrounded by a translational area

摘要

The apparatus has an articulating surface (20), defined by its body (12), for mating with a complementary implant, which includes a conforming surface (22) bounded by a translational surface (24). The conforming surface allows rotational movement between the articulating surface and the complementary implant and the translational surface allows rolling and translational movement between the articulating surface and the complementary implant. The conforming surface has the same spherical radius as the mating surface of the complementary implant and the translational surface has a radius which is greater than the spherical radius of the mating implant. The conforming surface is tangent at a periphery thereof to the translational surface.