Abstract: A knee joint prosthesis includes a C-shaped femur cap to be fitted onto a resected femur condyle. The C-shaped femur cap is made up of two arch-shaped parts spaced apart and connected by a relatively flat third part. Each of the arch-shaped parts has a different radius. The arch-shaped part with the larger radius has an oblong hole extending in the circumferential direction of the part. A shaft can be placed through the oblong hole from the femur into the tibia. In addition, a tibia cap can be fitted onto the plateau of the tibia.

Abstract: An implantable elbow joint for connecting the upper arm and the forearm includes an axially extending sleeve of C-shape transverse cross-section, a cylindrical member engageable within the sleeve, and a connecting member implantable in the ulna and engageable with the cylindrical member in the sleeve. The sleeve embraces the trochlea of the humerus through an angle of more than 180.degree. about the sleeve axis and also serves as the abutment for supporting the radius. The sleeve has a slot extending in the radial and the circumferential directions. At least in the region of the slot, the internal surface of the sleeve is formed by a cylindrically shaped surface. A cylindrically shaped sliding member is supported in the sleeve in the region of the slot. An elongated shaft is arranged to be inserted into the ulna with one end projecting out of the ulna and extending through the slot into the sliding member.

Abstract: A fastening system for a mucous membrane-supported denture is composed of a removable, mucous membrane-supported denture (3) and holding devices which effect a secure support during the wearing of the denture. The holding devices are composed of two greater than hemispherical heads (1) arranged either on natural teeth or on implants. The ball heads (1) are engaged in retaining caps (8) fastened in recesses (7) of the denture (3), the caps being composed of smooth, elastic plastic which contact the ball heads (1) only in the area of their equators M. Adapting rings (12) composed of a plastic material which is more elastic than that of the retaining caps (8) are arranged in the area of the openings (9) of the retaining caps (8) and effect a uniform contact of the retaining caps (8) on the ball heads (1). As a result, a secure support of the denture is achieved without a rigid connection between the ball heads (1) and the denture (3).

Abstract: A femur head cap for endoprosthesis possessing a spherical shape and having a recess for partially receiving the femur head, the recess being open toward the neck of the femur. The cap is advantageous in that it can be firmly anchored to avoid rotation and tilting without the use of bone cement and further allows for simple resection to be performed so that supply of blood to the bone is not impaired.

Abstract: An artificial head assembly for a human femur consists of the head portion roper and a metal pin. The head portion is a sintered ceramic ball having a polished contact face of convex, spherical curvature and a blind bore tapering conically inward toward the contact face. The pin is shaped for insertion of one end into the hollow stump of the femur, the other end tapering conically at the same apex angle as the bore in the ball. A knurling of the conical face of the pin reduces the compressive strength of the pin surface to less than the tensile strength of the ball so that the assembled head and pin can be sterilized without cracking the ceramic head portion because of differences in coefficients of thermal expansion between the metal and the ceramic material.