The piriformis might also spasm due to muscular weakness. Muscles Like to compensate for other muscles that are not performing their occupation. This comes about lots Using the piriformis. Your sacroiliac joints sit in between your left and right ilium (pelvic) bones as well as the central sacrum. These joints https://www.theorthopaedicandpainpractice.com/lower-back-and-buttock-pain/