Patent ID: 6019794
Filing Date: 2000-02-01
Classification: A61F

Abstract:
A total knee replacement prosthesis (TKR), comprising:(a) a tibial component having a stem received in a tubular bearing component of plastics material adapted to be inserted in an intramedullary canal of a tibia, the stem being rotatable within said bearing component to provide a degree of rotational laxity for the TKR;(b) a femoral component comprising a femoral stem adapted to be fixed in an intramedullary canal of a femur;(c) a pin for hingedly connecting said tibial component and said femoral component, the pin defining a lateral-medial hinge axis, the tibial component comprising an upper tibial plate portion and a pair of tibial ear portions at opposite ends of said plate portion, and said femoral component comprising a tubular body portion dimensioned to fit between said tibial ear portions and having a bore therethrough to receive said hinge pin, said hinge pin having opposite ends received in apertures pierced in said tibial ear portions, thereby forming a hinge permitting pivoting of said femoral and tibial components about said medial-lateral hinge axis, wherein the bearing component has a dished upper end, the tibial component having a corresponding convexly curved lower surface which is received by the dished upper end of the bearing component, whereby the tibial component tends to return to a position in which the hinge pin extends in a lateral-medial direction after removal of a rotational force; and(d) a plastic bumper insert extending between said tibial ear portions and adapted to contact and arrest said femoral body portion at points of extreme flexion and extension.