If non-surgical treatments do not ease symptoms or the shoulder joint is severely worn causing parts of the joint to become loose, a procedure called an arthroplasty may be recommended. This is a joint replacement treatment which involves replacing the ball with a synthetic ball and placing a cap for the scapula (known as a glenoid). After surgery passive shoulder exercises will be carried out and involve another person moving the joint. After 3-6 weeks patients are advised to start exercising the joint independently. Exercises and stretches are an important part of recovery and help to increase strength, flexibility and mobility in the joint. The success of surgery is dependent on the state of the rotator cuff muscles before surgery and the patient’s commitment to the exercise regime.