Characteristics and post-operative outcomes of surgery for fistula-in-ano managed at a tertiary care hospital in Sri Lanka: a retrospective study

OBJECTIVES: Management of fistula-in-ano is associated with recurrence and, occasionally, with anal incontinence. We investigated the clinical characteristics and outcomes of fistula-in-ano. METHODS: We included patients with fistula-in-ano managed at a tertiary care center (2016–2021). We collected clinical characteristics and 1-year outcomes using questionnaires. The chi-square test was used in statistical analysis. RESULTS: In total, 284 patients (231 men, 81.3%; median age 39.5 [range: 7–73] years) were included. Most patients had simple fistulae (n = 191, 67.3%). Transphincteric (n = 110, 38.7%) fistulae were the most common type, followed by intersphinteric fistulae (n = 103, 36.6%). Fistulotomy (n = 157, 55.3%) was the most common procedure. Follow-up details were traceable in 157 (55.3%) patients. At 1 year, the overall healing rate was 88.5% (n = 136). There was no association between type of surgical procedure and incontinence. The mean Vaizey score, used to assess anal incontinence, was 0.84 (range: 0–14). Incontinence was observed in 32 patients (20.9%), and flatus incontinence was the most common type (n = 17, 53.1%). Complex fistulae were associated with higher recurrence rates than simple fistulae (32.6% vs. 2.8%). CONCLUSION: The healing rate in surgical treatment of fistula-in-ano was 88.5%, with acceptable complication rates. There was no association between surgical procedure type and incontinence.