Cutting vs loose seton for complex anal fistula

What is known

• A multicenter study comparing seton to fistulectomy reported longer healing but lower recurrence with chemical setons (4% vs 11%). ¹
• Conventional vs internal-sphincter-preserving cutting setons showed no significant difference in recurrence (11.1% vs 6.25%) in 34 trans-sphincteric fistulae. ¹
• Loose/non-cutting setons in Crohn's show good initial closure but recurrence approaching 40% after removal; two-stage seton fistulotomy had high recurrence in non-Crohn's patients. ^2,3
• Cutting seton is generally not used in Crohn's fistulas and carries incontinence risk, particularly in women and those with prior perianal surgery. ⁴

What is unknown / caveats

• No direct cutting-seton vs loose-seton comparison was retrieved
• Reported recurrence differences come from comparisons against fistulectomy or between cutting-seton variants, not against loose setons
• Evidence is retrospective cohorts and small series, no RCT of cutting vs loose seton
• Crohn's vs non-Crohn's populations are mixed and cutting setons are typically avoided in [Crohn's disease](https://crohnsology.org (patient sites: crohnz.org)/)
• Whether recurrence differs between cutting and loose setons cannot be answered from the retrieved excerpts.

References

1. PMID: 22070555. (metadata not in corpus)

2. Larson DW, Pemberton JH. Current concepts and controversies in surgery for IBD. Gastroenterology. 2004;126(6):1611-9. PMID: 15168371.

3. Galis-Rozen E, Tulchinsky H, Rosen A, Eldar S, Rabau M, Stepanski A, Klausner JM, Ziv Y. Long-term outcome of loose seton for complex anal fistula: a two-centre study of patients with and without Crohn's disease. Colorectal Dis. 2010;12(4):358-62. PMID: 19220385.

4. PMID: 27236393. (metadata not in corpus)

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Draft, generated by the IBDology RAG and not yet clinician-reviewed. Answers are grounded in the retrieved literature listed above; a high faithfulness score means the answer matches its sources, not that the sources are correct.