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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.
In a person with hemophilia, the synovial joints are the ones damaged most often. Blood flowing into the space in the synovial joint causes damage to the joint. If this happens often enough, it causes crippling arthritis. The person will not be able to use the joint without a lot of pain. To show how this happens, we will look at a normal knee joint and compare it to one that has bled over and over.