A thin laser fibre is passed into the fistula track and fired while it is withdrawn. The heat destroys the lining of the track so that it can collapse and close. The external opening is left to heal. It is done under anaesthesia in an operation theatre.
| Type of fistula | Reported laser healing rate* | Comment |
|---|---|---|
| Simple, low fistula (first time) | Higher end of the range | Best results; but a simple fistula also does well with Kshar Sutra or fistulotomy |
| Complex / high / transsphincteric | Lower and variable | Longer or branched tracks are harder to seal completely |
| Recurrent fistula | Lower | Scar tissue and side branches reduce success |
| Pooled results across studies | Around 60–70% | Roughly one in three needs further treatment |
*Ranges are drawn from published case series and systematic reviews of FiLaC (2011–2023); individual results vary with the surgeon, laser settings, track length and follow-up period. Short follow-up studies tend to report higher success than long follow-up studies.
| Laser (FiLaC) | Kshar Sutra | |
|---|---|---|
| How it works | Heat seals the track lining | Medicated thread slowly cuts and heals the track from inside |
| Anaesthesia / OT | Required | Local anaesthesia; day-care in most cases |
| Number of sessions | One (repeat if it fails) | Weekly thread change for several weeks |
| Recovery | Quick | Work continues during treatment; overall course longer |
| Sphincter / continence | Sphincter-saving | Gradual cutting allows healing behind the thread, protecting continence when done correctly |
| Recurrence | Higher and variable | Low in controlled trials |
| Complex / recurrent fistula | Less reliable | Widely used, including for complex tracks |
| Cost | Higher (OT, anaesthesia, laser fibre) | Lower overall |
In a well-known multicentric randomised trial by the Indian Council of Medical Research (ICMR, 1991), Kshar Sutra had a lower recurrence rate than conventional fistula surgery (about 4% vs 11% at one-year follow-up), with fewer complications. Kshar Sutra is now part of standard Ayurvedic surgical practice in India. Read the full comparison: Ksharsutra vs laser treatment for fistula.
The procedure is done under anaesthesia, and post-operative pain is usually mild for a few days. But a quick, painless first week is not the same as a permanent cure — if the fistula recurs, the patient faces a second procedure. Ask your surgeon for their own recurrence rate and follow-up period before choosing.
A fistula that returns after laser or surgery can still be treated. Kshar Sutra is commonly used for recurrent fistula because the thread follows the actual track, including scarred areas. Dr. Pronab Haldar in Indore treats patients after failed laser and surgery. Call +91 63720 62915.
Published studies report primary healing roughly between 40% and 80%, with pooled results around 60–70%. Success is lower for complex, high and recurrent fistulas and with longer follow-up.
Yes. Around one in three patients in pooled studies need further treatment, often due to missed branches or an internal opening that did not close.
Laser offers quicker recovery but a higher and more variable failure rate. Kshar Sutra takes several weekly sittings but has shown low recurrence in clinical trials, including for complex fistula. The best choice depends on your fistula type.
Pain after laser is usually mild for a few days. Kshar Sutra causes some stinging after each weekly thread change, which settles within hours.
Yes. Kshar Sutra is commonly used for fistulas that recur after laser or conventional surgery.
