ACETABULAR CUP-LINER ASSEMBLY

摘要

The present invention relates to a cup-shaped member for a hip joint prosthesis for implantation into a cavity in the bone tissue in the acetabulum, and more particularly to an acetabular cup-liner assembly, in which the acetabular cup (1) has an outer surface intended to face the bone tissue in the acetabulum and an inner surface intended to face a liner (11). Said line r (11) preferably is made of UHMWPE (Ultra High Molecular Weight Polyethylene) and said cup (1) preferably is made of titanium. The liner (11) has an outer surface intended to face the inner surface of the cup (1), said cup (1) being provided with an opening adapted to receive said liner (11). A t least the parts (7) of the liner (11) corresponding to said parallel inside walls (3) of said cu p have dimensions which are equal to or a fraction less than the inner dimensions of said sidewalls (3). The parts (3) of the surfaces of the inner side walls of said cup (1) located adjacent to said opening of said cup (1) are essentially parallel to each other. The surface of at least said paralle l inner side walls (3) of said cup (1) is provided with a grooved region (4), said liner (11) having a n outer shape which is complementary to the inner shape of the cup (1). The parts (7) of the liner corresponding to said parallel inside walls (3) of said cup are provided with a grooved region (18 ) corresponding to said grooved region (4) on said cup (1).