dislocation of the hip [L, dis, apart, locare, to place; AS, hype] , displacement of the femoral head out of the hip joint, usually accompanied by pain, edema, rigidity, shortening of the leg, and loss of function. It may be congenital or acquired. Types of hip dislocation include obturator dislocation, in which the femoral head lies in the obturator foramen; perineal dislocation, in which the femoral head is displaced into the perineum; sciatic dislocation, in which the femoral head lies in the sciatic notch; and subpubic dislocation, in which the femoral head is displaced anteriorly.
