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: The invention relates to a joint part prosthesis, particularly for a finger joint, consisting either of a proximal or a distal component as well as a shaft extending away from this component, to be mounted in a bone. The invention provides that the shaft (4) is at least partially formed as an expansion sleeve (7).

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: A surgical instrument for implanting a wire, preferably into a bone, can be operated with one hand and thus acts as an extension of a surgeon's arm. The instrument is made up of a receiving element and a clamp part and also of a grip element. The grip element has two grip parts, the receiving element including the first grip part, and the clamp part including the second grip part. The receiving element has a recess for at least partial support of the wire, and the clamp part is mounted on the receiving element, so as to be able to move in rotation about a bearing point, and includes a clamp element which engages in the recess and is designed in such a way that, when the grip parts are pressed together, the clamp part presses the wire against the support.