Piriformis: Pain Pattern and Treatment
The piriformis crosses the buttock from the sacrum to the top of the femur. The sciatic nerve passes beside it, and in some people through it, so this muscle can produce both referred pain and true nerve irritation.
Attachments and action
Origin: The anterior surface of the sacrum, between the second and fourth sacral segments, with fibers also arising from the margin of the greater sciatic notch.
Insertion: The superior border of the greater trochanter of the femur, where its tendon commonly joins those of the obturator internus and gemelli.
Action: External rotation of the hip when the hip is extended; abduction when the hip is flexed. The muscle also stabilizes the hip during walking.
Where the pain is felt: The sacroiliac region, the buttock, and the posterior thigh. The sciatic nerve passes beside this muscle, and in some people through it, so piriformis tightness can also produce true nerve irritation. When the nerve is compressed, symptoms extend below the knee and can include tingling. When the pattern is referral only, the ache stays in the buttock and posterior thigh.
Common causes: Prolonged sitting, driving, running on sloped road surfaces, repeated hip external rotation in sport.
Patients say: Deep buttock ache, worst with sitting, sometimes with leg symptoms. Discomfort getting in and out of the car.
When to get evaluated: Neurological signs move this from pattern education to hands-on examination.
How this muscle is examined and treated
Examination tests whether hip positioning and direct pressure reproduce the buttock and leg symptoms. Dry needling releases the muscle; when the muscle is the compressing structure, releasing it addresses the nerve irritation at its cause. Acupuncture calms the inflammatory response along the nerve pathway. Assessment and treatment happen in the same visit.
Related conditions
This page is educational. It describes muscle referral patterns commonly associated with pain; it does not diagnose your condition. Individual patterns vary. For evaluation of your specific pain, see a licensed clinician. Seek immediate medical care for emergencies. Eugene Baek, L.Ac. · New Jersey License 25MZ00080600