ACTION: externally rotates the hip
REFERRAL: sacroiliac joint and leg

COMMENTS: The piriformis is an important external rotator. The most medial trigger point refers to itself, and can mimic sacroiliac joint pain (lower back pain). A tight piriformis can also impinge on the sciatic nerve. This is called piriformis muscle syndrome, and the client will experience pain, numbness or tingling down the back of their leg. The sciatic nerve can also be impinged at the sacral or lumbar nerve roots, so these areas must be tested as well. The best way to test the lumbar area for involvement is with the spring test- as shown in the DVD Deep Tissue and Neuromuscular Therapy, the Torso.

When working the piriformis muscle, also include the quadratus femoris, obturators and gemelli.