<unk>  is an operation performed on the<unk>  anal sphincter muscle for the treatment of chronic anal fissure. The<unk>  anal sphincter is one of two muscles that comprise the anal sphincter which controls the passage of feces. The procedure helps by lowering the resting pressure of the<unk>  anal sphincter, which improves blood supply to the fissure and allows faster healing. The procedure has been shown to be very effective, with 96% of fissures healing at a median of 3 weeks in one trial.
Lateral internal sphincterotomy
Michelassi strictureplasty
Finney strictureplasty
Anal sphincterotomy
Heineke–Mikulicz strictureplasty
Rectal dilator
Fistulotomy
Transoral incisionless fundoplication