Importance

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Abstract

A prosthetic knee joint enabling high-angle flexion includes the following members (a)-(c). (a) a femoral component which is adapted to be secured to a distal femur, consists of implant metal, has a concave portion with a depth of 10 mm or more on the lower central surface thereof, adapted to be in slidable contact with the patella or a patellar component, and has a pair of spaced bearing surfaces spaced by the concave portion, consisting of an anterior erect portion, a lower portion and a posterior erect portion, which portions form a smoothly curved surface; (b) a tibial component adapted to be secured to a proximal tibia, consists of implant metal and has an upper convex surface; (c) a unitary bearing insert which consists of polyethylene, is situated slidably between the femoral component and the tibial component in use, has an upper concave surface for supporting the spaced bearing surfaces of the femoral component, defined between an anterior end and a posterior end and having a curvature radius within the range of from 20 mm to 1000 mm on the entire surface between the anterior and posterior ends, and also has a convex lower surface.

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First Claim