Abstract: A device which is used to immobilize a threaded support pin (21) in relation to a fixed element (1, 34), the pin being screwed into a bone part (3, 3a, 3b) along an axis. A locking sleeve (13) can be solidly screwed to the fixed element (1, 34, 7) and is provided with an axial bore (19) in order to receive the pin (21). The axis (zz?) of the sleeve screw thread is angularly and/or laterally offset in relation to the axis (yy?) of the pin (21) when the latter is in place on the bone part (3, 3a, 3b), and/or the axis of the bore (19) of the locking sleeve (13) is angularly and/or laterally offset in relation to the screw threaded axis (6).

Abstract: A device used to immobilise a threaded support pin (21) in relation to a fixed element (1, 34), the pin being screwed into a bone part (3, 3a, 3b) along an axis (yy?). The device includes a locking sleeve (13) which can be solidly screwed to the fixed element (1, 34, 7) and which is provided with an axial bore (19) in order to receive the pin (21). The axis (zz?) of the sleeve screw thread is angularly and/or laterally offset in relation to the axis (yy?) of the pin (21) when the latter is in place on the bone part (3, 3a, 3b), and/or the axis of the bore (19) of the locking sleeve (13) is angularly and/or laterally offset in relation to the screw thread axis (6).

Abstract: Guide which allows a precise patellar cut to be made for fitting the prosthetic patella of a knee prosthesis using a trial femoral component, having a sliding plate (20) of a pin guide (30), a pin guide (30) comprising at least two channels (33) for guiding pins (50), which are installed perpendicularly to the sagittal plane of the condyle, and comprising two panels having two surfaces (32, 34) arranged at a right angle, the first panel having a flat surface (32) and a central aperture (31), and the second panel having a flat surface (34) towards the inside of the guide, a securing element (40) which cooperates with the shaft (23) to lock the pin guide (30) with respect to the sliding plate (20) and thus avoid translation movements.