Treatment of Complex Anorectal Fistula: High Transsphincteric, Suprasphincteric, Extrasphincteric, or Recurrent with Multiple Extensions

This protocol addresses the structured management of complex anal fistulas — a subgroup defined by their anatomical extent and involvement of the sphincter mechanism, which significantly raises the technical challenge of treatment and the risk of sphincter damage.

Clinical Scenario

Complex anal fistulas encompass several anatomical presentations that carry elevated risk and require sphincter-preserving strategies:

• High transsphincteric fistulas involving greater than 30% of the external anal sphincter
• Suprasphincteric or extrasphincteric fistulas (also involving greater than 30% of the external anal sphincter)
• Intersphincteric fistulas involving greater than 50% of the internal anal sphincter
• Recurrent anal fistulas
• Fistulas with horseshoe or multiple extensions

Treatment Approach

Management in this setting involves an initial sphincter-preserving strategy that addresses active sepsis and optimises the fistula tract before definitive repair. A draining approach may be employed as a preparatory step when there is excessive inflammation, suppuration, or concern about wound healing.