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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.
Degenerative joint disease is common in the lumbar (lower) spine because this region supports about half of the bodyâs total weight. A lifetime of pressure on the lower back can cause the cartilage within the facet joints to wear down, a condition that can lead to bone spurs, joint stiffness, inflammation and pain.