Orthopedic surgery may be required to correct contracture or spastic deformities, to provide stability for an uncontrollable joint, and to provide balanced muscle power. This includes tendon-lengthening procedures (especially heel-cord lengthening), release of spastic wrist flexor muscles, and correction of hip and adductor muscle spasticity or contracture to improve locomotion. Selective dorsal rhizotomy has provided marked improvement in some children with CP. The procedure involves selectively cutting dorsal column sensory rootlets that have an abnormal response to electrical stimulation. Achieving the benefits from the surgery requires intensive physical therapy and family commitment. Because the procedure results in flaccid muscles, the child must be retaught to sit, stand, and walk