A modification in the technique of biplane intertrochanteric osteotomy for slipped capital femoral epiphysis, used in twenty-four patients, allows supplementation of the corrective osteotomy by compression fixation. Healing is faster, and no losses in position have occurred with the new fixation apparatus. Eight of the twenty-four hips showed some degree of joint-space narrowing; no evidence of avascular necrosis has been observed.