Abstract: With the invention a pivotal securing system between a bone screw (1) with a spherical head part (2) and a reception part (3) is shown. The reception part has a passage bore (4) with a shoulder at its end which encloses the head part (2) at its lower side and which forms an abutment when the head part (2) is pressed on by the clamping screw (7) in a settable pivotal position (8). The head part (2) is executed as a separate part (9) which can be screwed together with the bone screw (1) in order to be able to place on the reception part (3) and to connect it to the latter after the implantation of the bone screw (1).

Abstract: The apparatus for the production of endochondral or osteochondral bores comprises a combination of a substantially hollow cylindrical sleeve (10), of which one end is formed as a circular cutting edge (11), with a flat borer (20) which is rotatably and axially displaceably arranged in the sleeve (10). Through pressing in of the cutting edge (11) into the tissue, advantageously only into the cartilage tissue, a tissue column is punched out which then is cut away and removed through screwing in of the flat borer (20). In this the boring is done up to the depth of the cutting edge (11) or deeper.

Abstract: An implant consisting of several support members (7), which are produced from an elastic plastic, is provided as a replacement for a part, which is no longer capable of bearing loads, of the core region of an intervertebral disk (3). The support members (7) are inserted one after the other into a central cavity (5) constructed in the core region by means of a tube (6) passing through an outer annular region (4) of the intervertebral disk (3) until said cavity is filled. When the cavity (5) becomes clogged with the filling members (7), they become deposited on the boundary walls of the annular region (4) and against one another and are elastically deformed under stress. Accordingly a universal implant which can be adapted to cavities (5) of any shape, and which forms a relatively compact, elastic support structure, can be achieved.