Injuries to joints of such a nature that the ends of the opposed bones are forced more or less out of connection with one another. Besides displacement of the bones, there is bruising of the tissues around them, and tearing of the ligaments which bind the bones together.

Dislocations, like FRACTURES, are divided into simple and compound, the bone in the latter case being forced through the skin. This seldom occurs, since the round head of the bone has not the same power to wound as the sharp end of a broken bone. Dislocations are also divided according to whether they are (1) congenital, i.e. present at birth in consequence of some malformation, or (2) acquired at a later period in consequence of injury, the great majority falling into the latter class. The reduction of a dislocated joint is a skilled procedure and should be done by an appropriately trained professional.