Children are sometimes born with certain joints in faulty positions, some of these being really traumatic and others of more obscure origin. The traumatic cases arise for the most part during parturition, either from the natural forces engaged in delivery, or by dragging on the part of attendants. The Hip-joint is not infrequently dislocated in this way, and usually the displacement is double. The head of the bone is usually displaced upwards so as to rest on the dorsum of the 'ilium above and behind the acetabulum. Through time the head makes for itself a new joint, and the acetabulum fills up. Congenital dislocations of other joints are exceedingly rare.