 Selective dorsal rhizotomy does not alleviate contractures caused by spasticity from before the surgery takes place; it simply prevents any more contractures or spasticity from occurring in future.With or without rhizotomy, the only way contractures can ever be relieved is via orthopaedic surgery.Fixed orthopaedic deformities of the legs caused by the previous years of intense spasticity are also not relieved by the nerve surgery and must also be corrected surgically.