The essential part of the surgery is to remove the damaged area and replace it with a shoulder prosthesis (artificial joint). To get to the shoulder joint an incision is made on the front of your shoulder. After exposing the shoulder joint, the damaged ends of the bone are removed. The bone is prepared for the placement of the artificial joint. The artificial joint is made of metal, usually a titanium or a cobalt-chrome alloy. The stem is placed inside the humerus bone. Bone cement may be used to secure the stem in the humerus. The glenoid component is made of a special plastic. The glenoid is cemented into place. Not all patients require a glenoid component. The final decision to use a glenoid component is made during the surgery. Patients with osteoarthritis and inflammatory arthritis generally benefit from the placement of a glenoid component. After the components are in place, the shoulder joint is checked to make sure that the shoulder is stable and has the potential for good motion after rehabilitation.