Horseshoe Fistulae in the Age of LIFT

Horseshoe fistula is a challenging benign anorectal condition to treat. The aim of this study was to assess the utilization and success of different definitive fistula repair techniques in the treatment of horseshoe fistula.

This was a retrospective case series which included all patients who were treated for horseshoe fistula from 2006 to 2019 at a single, tertiary care center and whom had at least one follow-up visit. Patients were excluded if < 18 years of age or carried a diagnosis of Crohn's disease. Patients were assessed for fistula recurrence and incontinence.

Sixty-eight patients were identified. On average, they were 47 years old, 63% male, and 18% current smokers. Seventy-nine percent required seton during their treatment course. Of the 8 first attempts at fistula repair, the types of repair included flap (15%), LIFT (35%), fistulotomy (31%), plug (12%), and fistulotomy and immediate reconstruction (1%). Recurrence for these procedures was as follows: flap 30%, LIFT 21%, fistulotomy 14%, plug 88%, and fistulotomy and immediate reconstruction 0%. Twelve patients who recurred underwent 17 additional procedures to attempt to cure their fistula. Overall, of those who underwent any attempt at definitive repair, 82% of patients were cured of their fistula, 12% had a chronic seton, and 6% had a chronic fistula. Thirteen percent of those who were cured had incontinence. The mean follow-up time was 1.1 years. Patients required a median of 3 procedures (range 1-11).

Horseshoe fistula remains a complex anorectal condition. Successful repair can be performed in > 80% of patients. However, repair can often require multiple surgical procedures.