ALEX BARTEL / SCIENCE PHOTO LIBRARY ALEX BARTEL / SCIENCE PHOTO LIBRARY
Dislocated shoulder. Man wearing a brace and sling to immobilize and support his dislocated shoulder. A shoulder dislocation occurs when the head of the humerus bone in the upper arm pops out of its ball-and-socket joint in the scapula (shoulder blade). This type of dislocation can happen during a fall, from a heavy blow to the shoulder, or twisting to the arm. It is a common sport's injury.
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