The shoulder prosthesis is the replacement of the joint by a plastic part by surgery, where it is indicated that the shoulder joint is seriously damaged by osteoarthritis. With this technique a reduction of pain and restoration of mobility is achieved. In the shoulder prosthesis a metal part to the humeral head and a piece of polyethylene shoulder blade, both sealed with cement or embedded is set. There is also the reverse shoulder prosthesis, aimed at patients aged 60 years, who returned shoulder mobility. In the inverted, in place of the humeral head is placed the receiver and where the receiver should be, the humeral head is placed. These prostheses are indicated in the massive rupture of tendons, beyond repair, which is associated with certain joint osteoarthritis.