 Dorsal rhizotomy/selective dorsal rhizotomy (SDR), less often referred to as selective posterior rhizotomy (SPR), is the most widely used form of rhizotomy, and is today a primary treatment for spastic diplegia, said to be best done in the youngest years before bone and joint deformities from the pull of spasticity take place, but it can be performed safely and effectively on adults as well.An incision is made in the lower back just above the buttocks and the nerves accessed and dealt with.SDR is a permanent procedure that addresses the spasticity at its neuromuscular root