COMPOSITE SHOULDER PROSTHESIS

摘要

Problem: In four parts fractures of the proximal humerus, the humeral head, the greater tuberosity and the lesser tuberosity separate from the humeral shaft. It is common practice to us shoulder prosthesis to treat those lesions. Often the tuberosities fall to unite to the rest of the humerus or unite in a wrong position. This results in a bad functional outcome. Solution: The invention is a modular composite shoulder prosthesis, whose construct incorporates a solid autogenous bone graft to be used to replace the upper humerus in certain fracture types. The prosthesis comprises a stem to be inserted in the canal of the humerus, an intermediary part reduced to a medial pillar and a head, which is a generally spherical cap that is hollow. The head of the prosthesis being hollow and coated with an osteoconductive material, the lateral aspect of the medial pillar as well as the upper part of the stem being also coated with the same material, a space is delineated in which a solid autogenous bone graft is fitted. Union can be achieved between the coated parts of the prosthesis, the bone graft and the tuberosities reattached to the humerus shaft, secured to holes of the medial pillar and between themselves by sutures or wires.