Unilateral versus bilateral internal sphincterotomy: a randomised controlled trial for chronic fissure-in-ano

INTERVENTION: Group A (active control): single internal lateral sphinterotomy Group B: (new treatment): double internal lateral sphinterotomy A minimum follow up of 6 months. CONDITION: Chronic fissure‐in‐ano ; Digestive System ; Chronic anal fissure PRIMARY OUTCOME: 1. Post‐operative pain; 2. Recurrences SECONDARY OUTCOME: 1. Healing of fissure, measured at 3 to 6 months; 2. Incontinence to flatuous and faecal matter, measured from the date of surgery until 6 months in the form of use of pad, soiling of undergarment INCLUSION CRITERIA: 1. Disease over one year 2. Aged more than 18 years