Complete displacement of the 2 bones in a joint so that they are no longer in contact, usually as a result of injury. (Displacement that leaves the bones in partial contact is called subluxation.) It is usually accompanied by tearing of the joint ligaments and damage to the membrane that encases the joint. Injury severe enough to cause dislocation often also causes bone to fracture. Dislocation restricts or prevents the movement of the joint; it is usually very painful. The joint looks misshapen and swells. In some cases, dislocation is followed by complications, for example, paralysis. A dislocated joint should only be manipulated by medical personnel. Firstaid treatment consists of applying a splint or, in the case of a dislocated shoulder, a sling. Sometimes, an operation is necessary to reset the bones.
Dislocation, joint |
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