At a glance
FiLaC — fistula laser closure — is a newer, minimally invasive option for treating anal fistulas. It uses a laser fibre to seal the fistula tract from the inside, with the goal of closing the tract while preserving the sphincter muscle.
It is not the right option for every fistula, and the evidence base is still developing. But for certain types of fistulas, particularly in people where sphincter preservation is a priority, it is an option worth understanding.
How it works
The FiLaC procedure involves:
- Identifying the fistula tract — usually done under anaesthesia with a probe
- Inserting a radial laser fibre into the tract from the external opening
- Activating the laser — the fibre emits energy in a 360-degree pattern, destroying the lining of the tract
- The internal opening is closed — typically with stitches or a small flap
- The tract is left to heal from the inside out
The key advantage is that the laser targets the tract itself without cutting through surrounding tissue, including the sphincter muscle.
Who it may be suitable for
FiLaC tends to be considered for:
- Simple or transsphincteric fistulas where preserving sphincter function is important
- People who have had previous fistula surgery and want to avoid further sphincter involvement
- Cases where incontinence risk from traditional surgery is a significant concern
- People who prefer a less invasive approach and accept a potentially lower success rate in exchange
It is generally less suitable for:
- Very complex or branching fistulas
- Fistulas with active, undrained abscess
- Situations where the internal opening cannot be clearly identified
What people describe about recovery
Recovery from FiLaC is commonly described as easier than recovery from open fistula surgery:
- Less pain than fistulotomy — many people describe manageable discomfort rather than significant pain
- Some drainage in the first week or two — this is expected as the tract heals
- Quicker return to daily activities — often within one to two weeks
- Less wound care than open surgery, since there is no large external wound
The main concern people describe during recovery is uncertainty about whether the tract has fully closed. Follow-up appointments and sometimes imaging help confirm healing.
How it compares to other options
| Factor | FiLaC | Fistulotomy | Seton | Advancement flap |
|---|---|---|---|---|
| Sphincter sparing | Yes | Depends on fistula | Yes (staged) | Yes |
| Success rate | 50-70% | 85-95% | High (staged) | 60-80% |
| Recovery time | 1-2 weeks | 4-8 weeks | Varies | 4-6 weeks |
| Pain level | Lower | Higher | Moderate | Moderate |
| Repeat procedures | May need | Rarely | By design | May need |
These are general patterns. Individual outcomes depend on the specific fistula, the surgeon’s experience, and many other factors.
Questions to ask your surgeon
If FiLaC is being discussed as an option for you:
- How many FiLaC procedures have you performed?
- What has your personal success rate been?
- Is my fistula type suitable for this approach?
- What happens if the FiLaC does not work — what is the next step?
- Is this available on the NHS or is it private only?
The evidence picture
FiLaC is a relatively newer technique, and the evidence base is still growing. Early studies show promising results for simple fistulas, but long-term data and large randomised trials are limited compared to established procedures like fistulotomy. This does not mean it is ineffective — it means the evidence is still maturing.
Your surgeon is the best person to help you weigh the evidence against your specific situation.