ACETABULUM PROSTHESIS ASSEMBLY

PROBLEM TO BE SOLVED: To provide an acetabulum prosthesis having an effective and simple mechanism for integrally joining and securing an acetabulum outer shell element to a liner element. SOLUTION: In an acetabulum prosthesis having an outer shell element which can be transplanted into a bone and a liner element 14 which can be engaged with the outer shell element, the outer shell element 12 has a generally projecting outer surface part for bone engagement and a generally recessed inner surface part. Grooves are formed in the inner surface part of the outer shell element 12 and extend to at least a part of the inner peripheral surface of the outer shell element 12. The liner element 14 has a recessed inner surface part and a projecting outer surface part being complementary to the inner surface part of the outer shell element 12 and having a shape which can be engaged therein. Further, one or more projecting surface configuration parts are formed on the outer surface part of a liner and selectively engaged in the grooves in the outer shell element 12. The liner can be joined integrally with the outer shell element 12 by engaging its projecting surface configuration parts into the grooves by a press fit.