FLOATING BEARING KNEE JOINT PROSTHESIS WITH A FIXED TIBIAL POST

摘要

This invention relates to a floating bearing knee joint prosthesis (146) having a fixed tibial post used for replacing the articulating knee portion of a femur and a tibia. The floating bearing knee joint prosthesis (146) includes a femoral component (152), a tibial component (154), a guide post (206) and a bearing member (156). The femoral component (152) includes an engagement member (176), a first femoral bearing surface (162) and a second femoral bearing surface (164). The tibial component (154) includes a tibial bearing surface (196). The guide post (206) extends from the tibial component (154) and is operable to be engaged by the engagement member (176) of the femoral component (152). The bearing member (156) includes a first bearing surface (200) that articulates with the first femoral bearing surface (162), a second bearing surface (202) that articulates with the first femoral bearing surface (164) and a third bearing surface (198) that articulates with the tibial bearing surface (196). The bearing member (156) further includes a posterior lip extension (284) that substantially inhibits the bearing member (156) from dislocating upon flexion of the knee prosthesis (146).