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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.
A dislocation occurs when extreme force is put on a ligament, allowing the ends of two connected bones to separate. Ligaments are flexible bands of fibrous tissue that connect various bones and cartilage. Ligaments also bind the bones in a joint together.Severe trauma on joint ligaments can lead to dislocation of the joint. The hip and shoulder joints are called ball and socket joints.Extreme force on the ligaments in these joints can cause the head of the bone (ball) to partially or completely come out of the socket.The most commonly dislocated joint is the shoulder. dislocation occurs when extreme force is put on a ligament, allowing the ends of two connected bones to separate. Ligaments are flexible bands of fibrous tissue that connect various bones and cartilage. Ligaments also bind the bones in a joint together.