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Piriformis Syndrome causes pain in the buttock which radiates down the leg and is due to the Sciatic nerve being impinged by the piriformis muscle.
Symptoms of Piriformis syndrome include tenderness or pain in the buttock muscle. The pain may radiate down the back of the leg into the hamstring muscles and sometimes even the calf muscles. It is common for pain to initially be confused with a hamstring strain or hamstring origin tendinopathy. However there will be no area in the hamstrings which is tender to touch. Reduced range of motion of the hip joint, especially into internal hip rotation is often seen.