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Causes. The shoulder joint is the most frequently dislocated joint of the body. Because it moves in several directions, your shoulder can dislocate forward, backward or downward, completely or partially, though most dislocations occur through the front of the shoulder. dislocated shoulder may be caused by: 1  Sports injuries. 2  Shoulder dislocation is a common injury in contact sports, such as football and hockey, and in sports that may involve falls, such as downhill skiing, gymnastics and volleyball. 3  Trauma not related to sports.
Osteochondritis dissecans is a joint problem that causes pain, swelling, and a locked up joint. A knee strain is a stretch or tear of a muscle or of a tendon and causes pain, swelling, and bruising. Dermatomyositis is a condition that causes muscle swelling and weakness, and a rash on the face and joints.