injuries poisoning
Piriformis Syndrome
Introduction
Piriformis syndrome is compression of the sciatic nerve by the piriformis muscle in the posterior pelvis, causing pain in the buttocks and occasionally sciatica. Diagnosis is by examination. Treatment is symptomatic. The piriformis muscle extends from the pelvic surface of the sacrum to the upper border of the greater trochanter of the femur. During running or sitting, this muscle can compress the sciatic nerve at the site where it emerges from under the piriformis to pass over the hip rotator muscles. Piriformis syndrome is uncommon. In piriformis syndrome, the sciatic nerve is compressed by the piriformis muscle in the posterior pelvis. 