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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.
bone decalcification. Osteoporosis is a progressive disease where the bones of the body de-calcify over time thus weakening the bone itself. This weakening of bone makes it more susceptible to fracture (with or without trauma). Usually these fractures occur in the hips, spine and wrist but certainly can occur anywhere in the body including the feet. It is estimated that over 10 million Americans have bone demineralization and many millions more have low bone mass known as osteopenia which if untreated will deteriorate to osteoporosis.