Posterolateral Versus Lateral Internal Anal Sphincterotomy for Chronic Anal Fissure

Inclusion Criteria: * Adult patients of both genders with chronic posterior anal fissure were included to the study. Exclusion Criteria: * Patients with anterior or lateral anal fissure, * patients with previous anal surgery, * patients with concomitant anorectal pathology, * patients with secondary anal fissure due to Crohn's disease or other specific etiology, * patients with any degree of fecal incontinence, * patients with active anorectal sepsis.