Piriformis syndrome is a neuromuscular condition in the event the piriformis muscle (a pear-shaped muscle mass during the buttocks) compresses the sciatic nerve (a nerve that extends from the lower backbone all the way down to the foot). This ends in pain inside the buttocks and hips. Illustrations with the https://www.theorthopaedicandpainpractice.com/lower-back-and-buttock-pain/