Introduction

An anal fistula is one of the most challenging anorectal conditions, often causing persistent pain, recurrent infections, and continuous discharge that can significantly affect a patient’s quality of life. Traditionally, surgical treatment involved cutting open the fistula tract (fistulotomy), which is highly effective for simple fistulas but may increase the risk of damaging the anal sphincter muscles in complex cases.

Over the past decade, advances in colorectal surgery have led to the development of several sphincter-preserving procedures designed to eliminate the fistula while protecting the anal sphincter and maintaining normal bowel control. These minimally invasive techniques have become the preferred option for many patients with complex anal fistulas.

In this article, we explore the latest sphincter-sparing treatment options, their advantages, and the patients who may benefit most from these modern surgical approaches.

Why Is Preserving the Anal Sphincter So Important?

The anal sphincter muscles are responsible for maintaining bowel continence by controlling the passage of stool and gas. Any surgical procedure that damages these muscles may increase the risk of fecal incontinence, particularly in elderly patients, women with previous childbirth injuries, or individuals who have undergone prior anorectal surgery.

For this reason, modern anal fistula surgery focuses not only on healing the fistula but also on preserving sphincter function whenever possible.

What Are Sphincter-Sparing Procedures?

Sphincter-sparing procedures are advanced surgical techniques that treat the fistula without dividing the anal sphincter muscles. Their primary goal is to eradicate the fistula tract while minimizing the risk of postoperative continence problems.

Recent clinical studies have demonstrated that these procedures can provide favorable healing rates with a significantly lower risk of compromising sphincter function when performed in appropriately selected patients.

Who Can Benefit from These Procedures?

Sphincter-preserving techniques are particularly recommended for patients with:

  • Complex anal fistulas
  • High transsphincteric fistulas
  • Recurrent fistulas after previous surgery
  • Selected patients with Crohn’s disease
  • Individuals at increased risk of postoperative incontinence

The choice of procedure depends on several factors, including the fistula’s anatomy, location, complexity, and imaging findings such as MRI or endoanal ultrasound.

LIFT Procedure (Ligation of the Intersphincteric Fistula Tract)

The LIFT procedure has become one of the most widely performed sphincter-preserving operations for complex anal fistulas.

This technique involves accessing the fistula tract within the intersphincteric plane, securely ligating it, and removing the infected tract while leaving the anal sphincter muscles intact.

Advantages of the LIFT Procedure

  • Preserves the anal sphincter muscles
  • Lower risk of fecal incontinence
  • Reduced postoperative pain
  • Faster recovery and return to daily activities
  • Can be repeated in selected recurrent cases

Limitations

Although the LIFT procedure has shown promising outcomes, it is not suitable for every type of anal fistula. Success largely depends on careful patient selection, fistula anatomy, and the surgeon’s expertise.

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