Abstract: A stem for an endoprosthesis to be anchored in a bone (3) comprises a chamber (4) which surrounds the stem periprosthetically, which can be sealed in a pressure tight manner and which can be expanded with a thermoplastic or thermostable filling material (16). The rigid stem (1) of the endoprosthesis is connected mechanically to the bone (3) via the expandable chamber (4) by means of the filling material (16). The filling material is isolated from the bone (3), however, by the wall of the pressure-tight chamber (4). This makes it possible to ensure that the outer wall of the chamber (4) adjacent to the bone is extremely biocompatible.

Abstract: A shaft-part for a joint-end prosthesis or bone-shaft replacement and is implantable in a tubular bone 1, including a hollow, frusto-conical braid 5 constituted by two mutually crossing series of fibers 2, 3. When traction is exerted on the fibers 2, 3, the frusto-conical braid narrows; if, on the other hand, compression is exerted on the fibers 2, 3, the diameter of the frusto-conical braid 5 widens. These effects may be used on one hand to implant while the shaft rests areally against the marrow cavity 13 and on the other hand to remove the shaft without complications in case of new operations.

Abstract: An osteosynthetic pressure plate having several holes for bone screws positioned along its longitudinal axis and having an underside with curved recesses, designed for positioning on the bone so that immediately upon implantation there are spaces between the bone and the pressure plate.

Abstract: An osteosynthetic compression plate with holes for the insertion of bone screws, with a cross-section that is trapezoidal or otherwise provides for a decreased plate surface against the bone while providing necessary rigidity.

Abstract: An intramedullary nail has a tip portion provided with means for engaging a bolt previously inserted into a bone transverse to the bone axis.

Abstract: An intramedullary nail has a tip portion provided with means for engaging a bolt previously inserted into a bone transverse to the bone axis.

Abstract: A drill guide for use with surgical compression plates having means to prevent the drill from contacting the sides of the plate holes when drilling obliquely.

Abstract: A surgical compression plate is provided with at least one elongated screw hole with a sloping camming surface that bows outwardly to provide a constant torque until the screw is seated or a torque that increases gradually and then diminishes until the screw is seated, with a sudden increase in torque on seating, thereby to advise the surgeon that the screw has been seated.

Abstract: A surgical compression plate is provided which is designed to permit the insertion of bone screws at angles up to 45.degree.. A drill guide capable of tilting to various angles, for use in connection with the novel plate is also disclosed.