Etiology — what causes it
Compression or irritation of the sciatic nerve within the deep gluteal space, often by the piriformis muscle but potentially by other deep gluteal structures (obturator internus, gemelli, fibrous bands). Anatomic variants (sciatic nerve passing through piriformis) may predispose.
Epidemiology — who gets it
True piriformis syndrome is uncommon — many cases historically labeled as such are actually proximal hamstring tendinopathy, lumbar radiculopathy, or SI joint pain. Careful differential is essential.
Clinical signs
Tenderness in the deep gluteal region, positive seated piriformis stretch test, FAIR (flexion–adduction–internal rotation) test, and exclusion of lumbar and SI pathology. Hip extension and external rotation strength sometimes deficient.
Symptoms
Deep buttock pain that may radiate down the posterior thigh, sometimes to the calf. Aggravated by prolonged sitting and active hip external rotation under load.
Best evidence for chiropractic treatment
Conservative care includes soft tissue work, hip strengthening (gluteal and deep external rotator focus), neural mobilization, and graded loading. Surgical decompression is rarely needed and reserved for refractory cases with confirmed entrapment.
When to seek emergency care
Some symptoms need urgent medical attention — not a chiropractic visit. Call 911 or go to the nearest emergency department for: progressive limb weakness, loss of bowel or bladder control, saddle anesthesia (numbness in the groin/inner thighs), severe unrelenting pain unrelieved by position, signs of fracture after significant trauma, chest pain, stroke-like symptoms (face drooping, arm weakness, speech changes), or any rapidly worsening or unusual symptom.
Bottom line
True piriformis syndrome is less common than commonly thought — careful differential is essential. Soft tissue work plus hip strengthening drives recovery.