The operative procedure described for femoral-shaft shortening avoids the complications of angulation, fracture of the nail, and genu recurvatum by allowing four weeks' postoperative immobilization of the limb either in a cast or in suspension. It also avoids error in degree of rotation and in the amount of bone removed by the use of a predetermined guide, and it avoids distraction by the use of an onlay graft secured with screws. The technique has proved to be simple and effective in the two reported cases.