Why Ksharasutra Has the Lowest Recurrence
Rate (<1%) for Fistula-in-Ano

Fistula-in-ano — an abnormal channel between the anal canal and the perianal skin — is one of the most frustrating conditions in proctology. Conventional surgery cuts the tract open (fistulotomy) or removes it (fistulectomy), yet recurrence rates of 20–40% are routinely reported in literature. Ksharasutra, the medicated thread described in Sushruta Samhita over 2,500 years ago, achieves something conventional surgery cannot: it heals the tract from inside out, layer by layer, while leaving the sphincter untouched.

What Is Ksharasutra?

Ksharasutra literally means "alkali thread." A surgical-grade linen thread is repeatedly coated with three medicinal agents in precise sequence over 21 days, creating a layered thread with pharmacological action built into its structure:

• Snuhi latex (Euphorbia neriifolia) — the base adhesive that binds subsequent coatings and provides mild debridement
• Apamarga Kshara (Achyranthes aspera ash) — an alkaline cauterant that destroys unhealthy granulation tissue and exerts anti-infective action
• Haridra (Curcuma longa) — a natural anti-inflammatory that reduces local swelling and accelerates healthy tissue formation

The completed thread has a pH of approximately 9–10, which is precisely calibrated to dissolve fibrous fistulous tissue without damaging normal mucosa or sphincter muscle.

The Procedure: Step by Step

• 1
  Diagnostic proctoscopy

  The fistulous tract is mapped under local anaesthesia using a probe and methylene blue dye to identify internal and external openings.

• 2
  Thread placement

  The Ksharasutra is threaded through the tract using a malleable probe, with both ends tied together to form a loop.

• 3
  Weekly thread change

  Every 7–10 days the thread is changed, progressively cutting and healing the tract simultaneously — called the "cutting and healing" mechanism.

• 4
  Complete tract elimination

  Over 6–8 weeks (depending on tract length), the thread passes through the entire tract, leaving a healed, scar-free channel in its wake.

How Does It Achieve <1% Recurrence?

The key to Ksharasutra's extraordinary outcomes lies in its simultaneous triple action:

Conventional surgery achieves only cutting. It removes the tract but leaves behind an inflammatory microenvironment that allows new tract formation — hence high recurrence. Ksharasutra's chemical action sterilises this environment while the mechanical action ensures no residual lining survives.

Ksharasutra vs Conventional Surgery: A Comparison

Who Is a Candidate?

Ksharasutra is indicated for all grades of fistula-in-ano, including complex, recurrent and high trans-sphincteric tracts where conventional surgery poses unacceptable incontinence risk. It is particularly valuable for patients who have already undergone failed conventional surgery.

What to Expect at Yathartham Shalyaveda

At our clinic, the Ksharasutra thread is prepared in-house using classical protocols under strict aseptic conditions. Thread changes are performed every 7–10 days as an outpatient procedure lasting under 15 minutes, with full aftercare guidance including sitz bath protocols, diet modifications and follow-up sigmoidoscopy.