Learn More About VAAFT Fistula Surgery Since the day that perianal fistula disease is known, surgeons have been trying to treat the disease without damaging the anal sphincters that control the stool. However, the nature of the disease and its spread to the anatomical areas around the anus, which is not easy to identify, have caused recurrence of the disease and in most cases led surgeons to treat fistula using more sphincter discontinuation methods.