The piriformis can also spasm resulting from muscular weak point. Muscles Like to compensate for other muscles that aren't doing their position. This transpires lots Along with the piriformis. The nerves from the lower limbs originate within the lower back (aka lumbar spine) with the commonest being the sciatic nerve. https://www.theorthopaedicandpainpractice.com/lower-back-and-buttock-pain/