Abstract: The invention relates to a structure for practicing the acrobatic and ludic form of sport consisting in creating figures in the air while being hung from elastic means (E) and, eventually, while bouncing on a flexible and/or elastic surface (T), the structure being formed by assembling elements (3, 4, 5) that create several exercising areas comprising, each, a pair of hanging-up points (41) at which the elastic means (E) are hooked in. It includes a base (1) which aggregates (2) of elements (3, 4, 5) are made integral with, independently from each other, each of the aggregates (2) having a globally triangular shape and being made integral with the base (1) through one of its angles and resting on the floor through another angle, while the third angle (41) forms one of said hanging-up points.

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.