Much has been written regarding slipping of the proximal femoral epiphysis or the so-called epiphysiolysis. The literature in the main consists of case reports and deals with diagnostic or etiologic criteria rather than with treatment. The therapeutic maneuvers which are recommended are designed essentially to realine the femoral head by either conservative or operative methods and to encourage its union to the neck by immobilization or rest. Unfortunately, inadequate follow-up histories are given in many of the cases reported, so that the reader is often unable to determine the value of the methods suggested. Despite the experience which was derived from the treatment of over 147 patients and which was reported in recent periodicals, there is still no unanimity of opinion regarding the most effective method of correction. This study is prompted by a desire to determine the end-results of cases in which the patients were treated for this condition