What this experience covers
This experience describes how people weigh the decision between fissurectomy and lateral internal sphincterotomy (LIS) when surgery for a chronic anal fissure becomes necessary. It draws from many anonymized accounts — people who researched both, people who discussed both with their surgeon, and people who have been through one or the other.
Neither procedure is universally better. The right choice depends on the individual situation, and the most consistent theme across these accounts is that a thorough conversation with a colorectal surgeon is more valuable than any amount of online research.
The pattern
Two procedures, one goal
Both fissurectomy and LIS aim to resolve a chronic anal fissure that has not responded to conservative treatment. They approach the problem differently.
Fissurectomy removes the damaged fissure tissue, along with any sentinel skin tag or hypertrophied papilla. The internal sphincter muscle is left intact. Healing happens through secondary intention — the wound is left open and closes gradually over weeks. It is sometimes combined with a botox injection to relax the sphincter during the healing period.
LIS divides a small portion of the internal anal sphincter muscle. This permanently reduces the resting sphincter tone, breaking the cycle of spasm and poor blood flow that prevents the fissure from healing. The wound from the procedure itself is small.
People describe understanding this fundamental difference as the starting point for their decision. One procedure removes the problem tissue. The other changes the underlying muscle tension that caused the problem.
The factors people weigh
The accounts reveal a consistent set of considerations that come up when people are choosing between the two:
- Sphincter preservation. Fissurectomy does not cut the sphincter muscle. For people who are particularly concerned about continence risk — especially those with existing bowel control considerations — this matters.
- Track record. LIS has a longer history and a larger body of outcome data. Its success rates are well-established, generally cited above 90%. Fissurectomy outcome data is growing but has a smaller evidence base.
- Recovery profile. Fissurectomy leaves an open wound that takes weeks to heal. LIS involves a sphincter cut but typically a smaller wound with a faster initial recovery. People weigh which trade-off feels more manageable for their circumstances.
- Surgeon recommendation. This emerges as the most influential factor in nearly every account. Surgeons often have a clear preference based on their training, experience, and assessment of the specific fissure.
- Fissure characteristics. The size of any sentinel skin tag, the condition of the surrounding tissue, and the patient’s sphincter tone all factor into the surgeon’s recommendation.
Making the decision
People describe the decision as difficult but ultimately clarified by one question: “Which procedure do you recommend for me specifically, and why?”
Surgeons who regularly treat chronic fissures typically have a well-reasoned preference for a given situation. They consider anatomy, sphincter tone, fissure characteristics, and the patient’s priorities. People who leaned into this expertise — rather than trying to become their own expert through online research — describe feeling more confident in their choice.
The most common regret across both groups is not the procedure they chose. It is the time spent agonizing over the decision while the fissure continued to affect their quality of life.