1. Ruling out piriformis syndrome before diagnosing lumbar radiculopathy;Niu;Chang Gung Med J,2009
2. Piriformis syndrome: Comparison of the effectiveness of local anesthetic and corticosteroid injections: A double-blinded, randomized controlled study;Misirlioglu;Pain Physician,2015
3. Injection of the piriformis muscle by fluoroscopic and electromyographic guidance;Fishman;Reg Anesth Pain Med,1998
4. Ultrasound-guided piriformis injection: Technique description and verification;Smith;Arch Phys Med Rehabil,2006
5. Piriformis syndrome: Anatomic considerations, a new injection technique, and a review of the literature;Benzon;Anesthesiology,2003