
Pain in the hip or buttock region may be due to the tightness in the piriformis muscle, located behind the hip joint and over the buttocks. The piriformis muscle is responsible for turning the leg and foot outward by rotating the hip joint. Tightness in this muscle can affect the sciatic nerve, which causes pain to extend down the leg. A piriformis injection of a steroid directly into the muscle helps to relieve the pain and can be used in conjunction with physical therapy.