A new concept of the etiology of congenital dislocation of the hip, which states that the process is simply an accident, is presented. It is observed that the diagnosis should be made at birth. The importance of obtaining movement of the hip, after the reduction has been stabilised, is stressed. Contact and function are mandatory for the natural production of a normal hip. A mobile brace is described which allows a wide range of movement while safely maintaining reduction. The success of this method of treatment supports the conception of the etiology on which it is based.