A fissurectomy is a surgical procedure that removes a chronic anal fissure, the small tear in the lining of the anal canal that refuses to heal on its own. Unlike the more commonly discussed lateral internal sphincterotomy, which cuts part of the sphincter muscle to relieve pressure, a fissurectomy focuses on excising the damaged, scarred tissue itself while leaving the sphincter largely intact. That sphincter-sparing quality is a big part of why interest in the procedure has grown, though the trade-offs between the two operations are more nuanced than a simple “better or worse.”
Why a Fissurectomy Becomes Necessary
Most anal fissures heal without surgery. The standard first-line approach involves dietary changes to soften stool, topical ointments that relax the sphincter and improve blood flow, and sometimes stool softeners. In clinical practice, patients who do not respond to this regimen are reassessed after roughly five to six weeks, and surgery is offered only when symptoms persist despite consistent conservative care.1PubMed Central. Fissurectomy Versus Lateral Internal Sphincterotomy in the Treatment of Chronic Anal Fissure: A Randomized Control Trial That “chronic” label matters. An acute fissure is fresh and still has a reasonable chance of closing on its own. A chronic fissure has been present long enough to develop scar tissue, fibrosis in the underlying sphincter muscle, and sometimes additional features like a sentinel skin tag at the outer edge or a small nodule at the inner edge.
The fibrosis is worth understanding because it explains why conservative treatment eventually stops working for some people. Studies examining sphincter tissue from patients with chronic fissures have found fibrosis throughout the internal anal sphincter, something absent in healthy controls.2PubMed. Histopathology of the internal anal sphincter in chronic anal fissure That scarring stiffens the muscle, reduces blood flow to the wound, and essentially traps the fissure in a cycle where it cannot get the conditions it needs to close. Surgery breaks that cycle by removing the damaged tissue and, depending on the technique, addressing the underlying sphincter tension.
What Happens During the Procedure
A fissurectomy is usually performed as a day-case procedure, meaning you go home the same day. Most patients receive regional anesthesia rather than general anesthesia, and the operation itself is relatively brief. The surgeon begins by examining the fissure, typically with a speculum, and then uses diathermy (a controlled heat instrument) to excise the fibrotic edges of the fissure. A triangular section of skin at the outer edge of the fissure is removed to expose the lower portion of the internal sphincter. If a sentinel skin tag or hypertrophied papilla is present, those are removed as well.3PubMed Central. Enhanced Approach to Treating Chronic Anal Fissures: Fissurectomy with Vertical Non-full-thickness Midline Sphincterotomy and Mucosal Advancement Flap
What happens after the excision varies depending on the technique and the surgeon’s judgment. In its simplest form, a fissurectomy alone removes the scarred tissue and leaves the wound to heal on its own from the bottom up, a process called healing by secondary intention. Some surgeons add a partial sphincterotomy at the fissure site, carefully dividing only enough of the internal sphincter to relieve tension while leaving about half of its thickness intact. Others perform a mucosal advancement flap, where healthy tissue from above the fissure is pulled down and sutured over the wound to promote faster closure. Research comparing fissurectomy alone to fissurectomy with an advancement flap has not found a clear advantage for adding the flap: healing rates, time to pain relief, and time to wound closure were similar between the two approaches in one large series.4PubMed. Fissurectomy with mucosal advancement flap anoplasty: The end of a dogma?
Fissurectomy Combined with Botulinum Toxin
One popular variation pairs the fissurectomy with an injection of botulinum toxin (Botox) into the internal sphincter. The idea is that the toxin temporarily paralyzes the muscle, reducing spasm and improving blood flow during the critical healing window, while the fissurectomy removes the scarred tissue that would otherwise block recovery. In one study following patients for a median of one year, about 95% were symptom-free at six weeks, and the overall long-term success rate was around 79%.5PubMed. Long-term follow-up after combined fissurectomy and Botox injection for chronic anal fissures No adverse effects from the toxin were detected, and the few patients who experienced recurrence were treated successfully with a repeat procedure.
The picture gets more complicated when you ask whether the fissurectomy itself adds benefit to the Botox injection, or whether the toxin alone does the heavy lifting. A recent review of the evidence concluded that adding a fissurectomy to botulinum toxin did not improve healing rates, and recommended the injection alone as a second-line option for patients who fail topical treatment.6PubMed Central. Management of chronic anal fissures: should fissurectomy be performed with botulinum toxin injection? This is one of those areas where the evidence is genuinely mixed. The combined approach clearly works for many patients, but whether both components are necessary remains an open question. Some surgeons continue to prefer the combination, reasoning that removing the fibrotic tissue gives the toxin a cleaner wound to work with, even if randomized comparisons have not consistently shown a benefit.
How Recovery Typically Unfolds
Recovery from a fissurectomy is a slower process than many patients expect. Because the wound often heals by secondary intention rather than being stitched closed, complete healing takes longer than a simple surgical incision. In a prospective study of 50 fissurectomy patients, all were free of pain by day 42 after surgery, and the average time for full wound healing was about 10 weeks, though this varied from patient to patient.7PubMed Central. Long-term Outcome of a Fissurectomy: A Prospective Single-Arm Study of 50 Operations out of 349 Initial Patients Pain relief tends to come well before the wound has fully closed, which is reassuring but can be confusing if you are checking the area and still see an open wound weeks after your symptoms have improved.
Some techniques produce faster closure. When fissurectomy was combined with anoplasty (where a flap of tissue covers the wound), all patients in one series healed within 40 days.8PubMed Central. Fissurectomy and anoplasty in posterior normotensive chronic anal fissure A pilot study using a CO2 laser for the fissurectomy found that about three-quarters of patients had complete healing at the one-month mark.9PubMed Central. Scanner-Assisted CO2 Laser Fissurectomy: A Pilot Study In a larger series where some patients received an advancement flap and others did not, the median time to healing was about two months, and median time to pain relief was roughly one month.4PubMed. Fissurectomy with mucosal advancement flap anoplasty: The end of a dogma? The takeaway is that most patients can expect meaningful symptom improvement within four to six weeks, with complete wound healing following sometime in the second or third month.
What to Do During Recovery
Postoperative care after a fissurectomy focuses on keeping bowel movements soft, managing pain, and keeping the wound clean. You will likely be advised to continue the same dietary modifications and stool softeners that were part of your conservative treatment. High-fiber foods and adequate hydration remain important because straining during a bowel movement is the last thing the healing wound needs.
Warm sitz baths are commonly recommended after anorectal surgery. Research on patients recovering from sphincterotomy found that while sitz baths did not produce a dramatic difference in pain scores compared with standard care, they did significantly reduce anal burning, which is one of the more bothersome day-to-day complaints during recovery.10PubMed. Effects of warm water sitz bath on symptoms in post-anal sphincterotomy in chronic anal fissure–a randomized and controlled study Most surgeons suggest sitting in a few inches of warm water for 10 to 15 minutes, two or three times a day and after bowel movements, during the first couple of weeks. Over-the-counter pain relief and sometimes prescription analgesics are used for the first few days, though the intensity of postoperative pain varies considerably from person to person.
You should expect some bleeding during bowel movements in the first week or two. Light spotting on toilet paper is normal. Heavy bleeding, worsening pain after initial improvement, fever, or difficulty urinating are signs worth calling your surgeon about promptly.
How Fissurectomy Compares to Lateral Internal Sphincterotomy
Lateral internal sphincterotomy, where the surgeon cuts a portion of the internal anal sphincter muscle on the side of the anal canal, has been the gold standard surgical treatment for chronic anal fissures for decades. It works by permanently reducing resting pressure in the sphincter, which improves blood flow and allows the fissure to heal. The question that drives debate is whether fissurectomy can match those results without the risk of permanently weakening the sphincter.
The evidence is somewhat conflicting. One randomized trial found that healing rates were comparable between the two procedures, with about 92% of fissurectomy patients and 96% of sphincterotomy patients achieving complete healing at six weeks.11International Surgery Journal. Comparative evaluation of fissurectomy versus lateral internal sphincterotomy in the treatment of chronic anal fissure However, another study found a larger gap: about 98% healing with sphincterotomy compared to roughly 76% with fissurectomy alone.12PubMed Central. Fissurectomy versus lateral internal sphincterotomy in the treatment of chronic anal fissures: no advantages in terms of post-operative incontinence
The supposed advantage of fissurectomy, preserving continence by not cutting the sphincter, has also proven less clear-cut than expected. That same study comparing the two procedures found that both techniques produced some new incontinence symptoms in a small percentage of patients, and the difference between the groups was not statistically significant.12PubMed Central. Fissurectomy versus lateral internal sphincterotomy in the treatment of chronic anal fissures: no advantages in terms of post-operative incontinence The incontinence after fissurectomy tended to be milder, but the finding that it occurs at all was surprising to many surgeons who had assumed the sphincter-sparing approach would essentially eliminate the risk.
The practical takeaway is that fissurectomy is not automatically the safer choice, and sphincterotomy is not automatically the more effective one. The decision often depends on individual risk factors. Patients with lower resting sphincter pressures, women who have had obstetric injuries, and older adults may be better candidates for fissurectomy because they have less sphincter reserve to sacrifice. Patients with very high sphincter pressures and no continence risk factors may do well with either approach.
Long-Term Outcomes and Recurrence
One concern with any fissure surgery is whether the problem comes back. Fissurectomy performs reasonably well on this front, though the numbers depend on how long patients are followed. In a large review with a mean follow-up of over eight years, the recurrence rate was about 12%, with minimal impact on continence.13Journal of Visceral Surgery. Review Update on the management of anal fissure A prospective study following patients for a median of about a year after healing found that roughly 94% remained cured at the end of primary follow-up, and about 94% of those were still cured at the long-term check-in. The few patients who did experience recurrence were managed successfully with conservative medical treatment alone.7PubMed Central. Long-term Outcome of a Fissurectomy: A Prospective Single-Arm Study of 50 Operations out of 349 Initial Patients
Continence scores before and after surgery were not statistically different in that same study, which is the finding patients worry most about. The ability to control gas and stool after a fissurectomy appears to remain intact for the large majority of patients. For the anoplasty variation, one series reported no new incontinence at all over an 18-month follow-up, with only two recurrences, both of which healed with conservative care.8PubMed Central. Fissurectomy and anoplasty in posterior normotensive chronic anal fissure
Ruling Out Other Conditions Before Surgery
Not every chronic anal fissure is straightforward, and part of the preoperative process involves making sure the fissure is what it appears to be. Typical chronic fissures occur along the midline of the anal canal, most often at the back. Fissures that are multiple, irregularly shaped, or located off the midline raise suspicion for underlying conditions and are generally excluded from standard fissurectomy protocols.14Journal of Coloproctology. Evaluation of outcomes in fissurectomy and V–Y advancement flap for the treatment of chronic anal fissure Conditions that can mimic or complicate anal fissures include Crohn’s disease, tuberculosis, sexually transmitted infections, and rarely, malignancy. Your surgeon will want to rule these out before proceeding, sometimes with blood tests, biopsies, or imaging.
Fissures in Crohn’s Disease
Anal fissures are common in Crohn’s disease, and treating them is considerably more complicated. The traditional surgical approach to Crohn’s-related fissures has been cautious, because the impaired wound healing and unpredictable inflammation in Crohn’s patients raise the risk of complications like non-healing wounds and fistula formation. Yet evidence suggests that being too conservative may leave patients suffering unnecessarily. One study found that fissures in Crohn’s patients healed more often after direct anorectal surgery (about 88%) than after medical treatment alone (about 49%).15PubMed. Anal fissure in Crohn’s disease: a plea for aggressive management
Newer approaches for this population are being explored. A pilot study tested injecting freshly collected autologous fat tissue directly into the fissure site in Crohn’s patients. At three months, just over half of patients achieved complete healing, and among those who did not fully heal, most experienced substantial pain reduction and visible improvement in fissure size.16PubMed Central. Treatment of chronic anal fissure in Crohn’s disease patients with freshly collected autologous adipose tissue: a pilot study This is still early-stage research, but it reflects the broader trend of looking for sphincter-sparing and tissue-regenerative options for patients who cannot tolerate standard surgical approaches. If you have Crohn’s disease and a chronic fissure, the management strategy will likely involve close coordination between your gastroenterologist and colorectal surgeon.
Laser-Assisted Fissurectomy
One newer variation uses a CO2 laser instead of conventional diathermy to excise the fissure tissue. The appeal of laser fissurectomy is theoretical precision: the laser can remove tissue with less thermal spread to surrounding structures, which could mean less postoperative pain and faster healing. Early results from a pilot study were encouraging, with about three-quarters of patients showing complete wound closure at just one month.9PubMed Central. Scanner-Assisted CO2 Laser Fissurectomy: A Pilot Study The evidence base is still thin, though. Most of the published work on laser fissurectomy comes from small, single-center series without comparison groups, so it is too early to say whether this technique genuinely outperforms conventional fissurectomy or just sounds appealing. It is worth asking about if your surgeon offers it, but the lack of comparative data means you should not feel like you are missing out if it is not available at your center.
Who Is a Good Candidate
Fissurectomy tends to be favored for patients where sphincter preservation is a priority. That includes women who have had vaginal deliveries (especially complicated ones), older patients whose sphincter tone may already be declining, patients with irritable bowel syndrome or frequent loose stools, and anyone who has had prior anorectal surgery that may have already reduced sphincter function. It is also considered a reasonable option for patients with normal or low resting anal pressures, where a sphincterotomy might reduce pressure below the threshold needed for continence.
On the other hand, if you have very high resting sphincter pressures and no risk factors for incontinence, a sphincterotomy may offer a modestly higher healing rate with a very low risk of continence problems. The decision is not one-size-fits-all, and a conversation with a colorectal surgeon who performs both procedures regularly is the best way to figure out which approach fits your situation. Some surgeons also offer the combined Botox approach as a middle-ground option, particularly for patients who want to avoid any permanent alteration of the sphincter muscle.