Abstract: Shoulder joint prosthesis, especially a reverse shoulder joint prosthesis, having a joint part, especially a humeral socket (10), connectible at the proximal end of a humeral shaft (18). The joint part associated with the humeral shaft (18) is held displaceably relative to the shaft (18) at least in the antero-posterior direction.

Abstract: In an endoprosthesis (11h) for a joint, the two interacting joint parts (15h, 16h) are joined by a cord-type connection piece (21h), which is attached in the vicinity of the body axis (M2h, M2h′) of the convex condyle (15h) and extends through a longitudinal groove (22h) in the flexion direction of the joint. The connection piece assures a play space (31h) between the contact surfaces (19h, h′, 20h, h′) of joint (11h). It is protected from friction on groove wall (55h, 55h′) by an elevation (50h, 43h) in concave joint part (16h). An elevation (43h, 50h) at concave joint part (16h) and a depression (49h) at convex joint part (15h) interact in such a way that the lateral movement play space between depression and elevation determines the freedom of movement with respect to the lateroflexion of the joint.

Abstract: A wrist prosthesis has a radial part and a metacarpal part (12). A joint connection (15) connects the radial and the metacarpal parts including shafts for placement in the metacarpal bone and the carpal regions. The joint connection (15) is biaxial and permits both dorsal/palmar flexion and radial/ulnar deflection. The radial/ulnar flexion has a swivel radius (R.sub.1). The dorsal/palmar flexion has a swivel radius (R.sub.2). The radius (R.sub.1) is greater than the radius (R.sub.2). The contacting joint surfaces are congruent in all relative positions. A separate collar is provided for slipping onto the shaft of the radial part. The collar has a conical taper, a roughened surface and longitudinal ribs.