Piriformis muscle is located deep in the buttock and helps to rotate the leg outwards. It extends from the side of sacrum and tailbone to the upper part of thigh bone. One of the main nerves of the leg (sciatic nerve) runs in close relation to this muscle. Problems of the piriformis muscle such as spasms or swelling, can cause irritation of the sciatic nerve leading to sciatica like symptoms. This condition is addressed as piriformis syndrome (PS).
