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A retrospective analysis of the results of treatment of fistula-in-ano using a radiowave device.Nine hundred and seventy-six patients were operated on for perianal fistula. The mean follow-up time was 6.8 years. Postoperative complications, wound healing time, time off work, recurrence and the incidence of anal sphincter dysfunction and incontinence were recorded.Treated fistulae were subcutaneous in 28.1%, inter-sphincteric in 39.1%, and transsphincteric in 32.8%; supra-sphincteric and extra-sphincteric fistulae were not included. In 14.6% of patients, more than one fistula track waspresent. Complications occurred in 1.4% of patients, and included postoperative bleeding, abscess formation,premature approximation of the skin edges, haemorrhoidalprolapse and local allergic skin reactions. Incontinence to flatus or liquid occurred in 3.8%. The recurrence rate was 1.7%.Radiowave fistulotomy offers a short operation time, less postoperative pain, early return to normal activity, and faster wound healing.