Abstract: An orthopedic screw fastener system, includes at least one screw, consisting in each case of a screw head and of a screw shank, the screw head being provided with a thread, and at least one plate with a thickness, provided with at least one through-bore which is able to receive a screw. The plate has a through-opening, formed by at least two through-bores, each through-bore being defined by a midpoint and by a radius, and the through-bores are offset relative to each other and intersect each other in such a way that intersection lines and/or intersection surfaces form, which extend into the depth of the through-opening.

Abstract: The invention relates to a joint part prosthesis, particularly for a finger joint, consisting of either a proximal or a distal component, as well as a shaft that extends away from this component, to be mounted in a bone, which shaft is configured with a fin-like anti-twist device. According to the invention, it is provided that as an anti-twist device (7), at least two anti-twist elements (8) are disposed on the mantle surface (6) of the shaft (4), with rotation symmetry, and extend radially away from this mantle surface (6) and in the longitudinal direction of the shaft (4), whereby the distance of the anti-twist elements (8) from the mantle surface (6) decreases slightly in the direction toward the free end (5) of the shaft (4).

Abstract: In an implant for fusion of bones or bone parts, particularly of the carpal region of a wrist, as well as for application of compression between the bones or bone parts, a base body with bone screws is provided, which are guided in recesses that possess a geometry by means of which the compression between the bone, in each instance, can be adjusted, whereby the base body is configured with rotation symmetry. The geometry of its recesses has the shape of an oblong hole curved in the circumference direction of the base body, in each instance, whose curvature, with reference to the central axis of the base body, runs at an incline to this axis, in such a manner that the bone screws screwed into the bones and guided in the recesses in the manner of a motion link can be moved in the direction of the inclined oblong holes, radially toward the central axis of the base body, by means of a rotational movement of the base body.