Twenty-three patients with twenty-six congenital hip dislocations treated by the Ferguson procedure were reviewed. The study was undertaken to determine if this method of treatment has any effect on the incidence of avascular necrosis of the femoral head and if there are preoperative factors that can assist in predicting the success of treatment. Clinical and roentgenographic criteria were utilized and only dislocations of the hip unassociated with other disorders were included. Avascular necrosis did not occur in these patients during the period studied. It was also found that patients who were more than twelve months old at the time of operation and had a acetabular index of 40 degrees or more had a high incidence of redislocation.