ANATOMICAL MOTION HINGED PROSTHESIS

摘要

A hinged knee prosthesis (10) comprises a tibial component (16) and a fem oral component (14). The tibial component (16) is configured to attach to a tibia. The tibial component has a bearing surface (128). The femoral compone nt (14) is configured to hingedly attach to the tibial component (16) and ro tate relative to the tibial component (16). The femoral component (14) compr ises a medial condyle (30) and a lateral condyle (32). The medial and latera l condyles (30 and 32) have an eccentric sagittal curvature surface (50) con figured to rotate and translate on the bearing surface (128) of the tibial c omponent (16). A method of rotating a hinged knee (10) through a range of fl exion is provided. The method fixedly attaches a femoral component (14) to a tibial component (16). Axial rotation of the femoral component (14) is indu ced relative to the tibial component (16) when the hinged knee (10) is flexe d.