Summary- Two groups of patients with cerebral palsy (CP) were studied pre- and postoperatively by gait analysis after proximal release of distal transfer of the rectus femoris for treatment of knee stiffness in swing phase. In the first group studied, 12 patients underwent distal rectus femoris transfer. After surgery, peak knee flexion was increased 9.1° in swing phase by proximal rectus release and 16.2° by distal rectus transfer. Hip motion throughout the gait cycle was not significantly affected by either operation, and no tendency for a crouch gait was observed after either proceedure.