Hip-joint cup able to be anchored in the pelvis without cement

摘要

A hip-joint cup which is to be anchored in the pelvis without cement consists of a metallic support shell (3), which has several spike-shaped anchoring elements (8) for anchoring in the bone tissue (1) and which is lined on its outer surface with a multi-layer metal grating (4) for the promotion of bone incorporation, and of an inner plastic shell (5) anchored in the support shell (3) by snap-locking means (6). The support shell consists of deep-drawn sheet steel which, on one half of the shell, has two outwardly directed and collar-shaped breaks (8), which have projecting and tapering cutting edges and which widen conically inwards from the respective cutting edge. During the pressing-in, the breaks (8) afford an anchoring against the outside and with respect to a remaining inner journal (10) of bone tissue. In cases where the overall anchoring is inadequate, the breaks (8) serve as a centring and bearing for additional bone screws (14). …IMAGE…