Eighty six patients with chronic anal fissures were treated at Al-Kindy Teaching Hospital from 1992-1996 by fissurectomy and internal midline posterior sphincterotomy. All patients had satisfactory results with a period of follow up ranging from 4-7 years, no recurrence of the symptoms or major complications resulted from this operation. The advantage of this operation and its safety is discussed. We have found this procedure is useful and safe for the treatment of chronic anal fissure