Piriformis syndrome can be a neuromuscular problem if the piriformis muscle mass (a pear-formed muscle within the buttocks) compresses the sciatic nerve (a nerve that extends within the lower spine many of the way all the way down to the foot). This brings about pain from the buttocks and hips. https://www.theorthopaedicandpainpractice.com/lower-back-and-buttock-pain/