1. 1. Yeoman W. The relation of arthritis of me sacroiliac joint to sciatica. Lancet. 1928; 2:1119-1122.
2. 2. Edwards FO. Pyriformis syndrome. Yearbook of Selected Osteopathic Papers. Colorado Springs Co: American Academy of Osteopathy; 1962:39-41.
3. 3. Warwick R. Gray's Anatomy. 35th ed. Philadelphia Pa: WB Saunders Co; 1973.
4. 4. Hollinshead WH. Buttock Hip Joint and Thigh. Anatomy for Surgeons: The Back and Limbs. 2nd ed. New York NY: Hoeber Medical Division Harper and Row; 1969.
5. 5. Bonica JJ. The Management of Pain. 2nd ed. Philadelphia Pa: Lea & Febiger; 1990.