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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.
Osteoarthritis is considered a form of degenerative joint disease because it occurs when the cartilage that normally surrounds and protects the joints wears away. When the cartilage is worn away, bones rub against one another, causing pain and disability. Pain and stiffness in the joints are the most common symptoms. The pain may be worse after exercise, or when placing weight or pressure on the joint. Eventually, this form of degenerative joint disease causes the joints to become stiff and harder to move.