Abstract: A device for elongating long bones such as thigh bones, shin bones and arm bones, including an intramedullary nail with a tubular sleeve (4), and an extension (5) axially slidable within the sleeve (4). The sleeve and the extension include means (6; 7) for rigidly connecting them to two bone portions separated by an osteotomy, and means for moving the extension (5) relative to the sleeve (4), whereby both the intramedullary nail and the corresponding bone may gradually be elongated. The means for moving the extension (5) relative to the sleeve (4) include an electric motor (8) arranged within the sleeve (4) and linked to a speed reducer (9) driving a screw/nut assembly (13, 14, 15) for moving the extension (5) relative to the sleeve, and means (2) for supplying power to the electric motor (8) and automatically controlling the value and direction of the movement imparted to the extension (5) in the sleeve (4) by the screw/nut assembly (13, 14, 15) driven by the electric motor (8).

Abstract: Total trochitero-acromial shoulder prosthesis comprising two elements, namely, a trochiterian element (13), having the shape of a convex spherical sector, and equipped with means for fastening to the site of the trochiter, and an acromial element (12) having a bearing surface for the trochiterian element (13) and equipped with means for fastening to the lower face of the acromion, in such a way as to cover the afore-mentioned trochiterian element, and whose dimensions are such that the acromional element remains free to move, without overshooting the clavicle, as one with the acromion, once the latter has been sectioned at the level of the pillar of the scapular spine and a method of using the same.