Abstract: Joint prostheses which have one joint partner configured as a socket and the other joint partner configured as a ball head generally consist of two components. The socket is comprised of a metallic outer cup in which an insertion cup made of ceramic material or of a biocompatible plastic is inserted. The shaft has a peg, the so-called cone, on which a ball head is placed. The press fit connection, especially so-called conical pressing, is used as a connection technique between the respective components. Stress can result in a relative movement between the components, thus leading to a wear-related loosening of the connection thereof. In order to solve this problem, the invention provides that, from the prosthetic components (2, 3), the component (3) made of ceramic or plastic fitted with a covering (6), said covering being made of a biocompatible metal or of a biocompatible metal alloy, on the pressing surface (7) thereof via which said component (3) is connected to the metal component (2).

Abstract: A protective cap for prosthetic joints having one element in the form of a ball head, especially in the case of hip end-prosthetic joints, protects the ball head when it is positioned and fixed on the cone of the shank by the surgeon by hand. A crown is arranged on the pole of the protective cap. The crown is in the form of a plate for, the shape of the plate and its extent relative to the protective cap being such that it is possible to grip behind the plate on the side that faces the protective cap.

Abstract: Disclosed is a hip-joint socket for insertion into bone tissue. The hip-joint socket has an outer metal shell and an inner antifriction shell, the contact surface of the antifriction shell in the metal shell being conical in shape. The antifriction liner lies upon the conical contact surface without self-locking and the antifriction liner is fixed in the metal shell by a retaining ring. The antifriction shell is thus protected against canting and drop-out but can be removed out of its seat nondestructively and replaced.