Rectal Prolapse Repair Following a Posterior Sagittal Anorectoplasty

Rectal prolapse following anorectal malformation repair creates a mechanical problem that extends beyond cosmesis 0:19. The prolapsed tissue produces mucus and bleeds, but the functional consequence matters more: the redundant tissue prevents complete anal closure, directly compromising continence 0:19 0:19. A child who has undergone posterior sagittal anorectoplasty already faces continence challenges; allowing prolapse to persist compounds them 0:19.

Verify Before You Cut

The first move is not incision but confirmation 0:44. Before addressing the prolapse, the anoplasty position must be verified with electrical stimulation 0:44. You are looking for circumferential muscle contraction — evidence that the original repair placed the rectum within the sphincter complex 0:44. If stimulation produces asymmetric or absent contraction, the prolapse may be the least of the patient's problems 0:44. Proceeding with a cosmetic repair when the fundamental anatomy is wrong wastes an operation.

Stricture Risk Drives Dissection Strategy

The teaching point that separates novice from experienced technique: leave healthy tissue alone 1:35. This patient has unilateral prolapse on the left; the right side of the anoplasty remains well-positioned 1:35. The instinct to "complete the circle" and revise the entire circumference creates unnecessary risk 1:35. Circumferential dissection and suturing invite stricture formation 1:35. By limiting dissection to the prolapsed segment, you address the mechanical problem while preserving undisturbed mucosa that will not scar down 1:35.

The dissection itself requires precision about planes 1:27. Full-thickness rectum is incised off the skin edge, but the underlying sphincter muscle must be preserved 1:27. This is not a mucosal advancement — you are removing redundant bowel wall while leaving the continence mechanism intact 1:27. The distinction matters because violating the muscle plane either weakens the sphincter or creates scarring that tethers it.

Tension Determines Adequacy

How much rectum to mobilize is a judgment learned through repetition, but the principle can be stated: mobilize until there is slight tension, and the intended cut line will comfortably reach the anal skin without being pulled 1:47. Too little mobilization leaves redundancy that will prolapse again 1:47. Too much creates a repair under excessive tension that either dehisces or strictures as it heals.

Before making the final cut, place additional sutures into the redundant tissue to straighten it 2:13. This maneuver prevents the rectum from bunching or twisting as you complete the anastomosis 2:13. The geometry of the repair depends on the tissue lying flat; folds and pleats create irregular healing and recurrent prolapse.

The Anoplasty Itself

Dividing the prolapse into upper and lower quadrants creates two triangular segments that can be managed independently 3:28. Each bite of the anoplasty suture captures anal skin on one side and full-thickness rectal wall on the other 2:47. This is not a running closure — each suture must be placed individually and tied under slight tension 4:48. When the sutures are cut, the anoplasty should retract back to sit flush with the skin 4:48. If it puckers or everts, the tension was wrong.

What This Operation Teaches

The broader lesson embedded in this repair: not every abnormality requires complete revision 1:35. The temptation in reconstructive surgery is to pursue symmetry and completeness, but the experienced surgeon recognizes when partial intervention achieves the goal with less morbidity 1:35. A unilateral prolapse does not demand bilateral dissection 1:35. The right side of this anoplasty was left untouched not because it was forgotten, but because it was already correct 1:35.

Rectal prolapse following posterior sagittal anorectoplasty presents a technical challenge that requires balancing adequate repair against the risk of iatrogenic stricture 0:11. This discussion walks through a unilateral repair one year after the index operation, emphasizing the judgment calls that preserve continence while minimizing complications.

Verify before you cut

Before addressing the prolapse itself, confirm the anoplasty is correctly positioned 0:44. Use electrical stimulation to demonstrate circumferential sphincter contractions — if the neo-anus sits eccentric to the muscle complex, you are repairing the wrong problem 0:44. A well-located anoplasty that prolapses is a technical issue; a malpositioned one is a strategic failure that this repair will not fix.

Understand what the prolapse costs

Rectal prolapse after anorectal malformation repair is common 0:11, but not all prolapses demand intervention. The functional burden determines urgency: mucous discharge and bleeding are nuisances, but interference with anal closure directly undermines continence 0:19 0:19. A patient who cannot approximate the anal verge because redundant mucosa prevents apposition will not achieve bowel control no matter how good the original sphincter preservation was 0:19 0:19. That mechanical interference — not the cosmetic appearance — drives the decision to operate.

Limit the dissection field

The central technical decision is whether to take down the entire circumference or address only the prolapsing segment. In this case, a unilateral left-sided prolapse is repaired while leaving the right side of the anoplasty completely untouched 1:35. The logic: postoperative stricture risk scales with circumferential dissection 1:35. If three-quarters of the anastomosis is healing undisturbed, scar contracture is far less likely to produce a functionally significant stenosis. This is not about being conservative — it is about not creating a second problem while solving the first.

Mobilize to slight tension, not to excess

Full-thickness rectal wall is incised off the skin edge, preserving the underlying sphincter muscle 1:27. The rectum is then mobilized until there is slight tension and the intended cut line will comfortably reach the anal skin 1:47. "Slight tension" is the operative phrase — too little and you leave redundancy that will re-prolapse; too much and you create a repair under strain that will either dehisce or stricture 1:47. Before dividing the redundant segment, place additional sutures into the excess tissue to straighten it 2:13. This maneuver clarifies the geometry and prevents the accordion effect that makes it difficult to judge how much to resect 2:13.

Construct the anoplasty under controlled tension

The Lone Star retractor provides stable exposure 2:28[q3]. The anastomosis itself is straightforward: bites of anal skin to full-thickness rectal wall 2:47. Dividing the prolapse into upper and lower quadrants creates two triangular segments that are easier to manage than a single large flap 3:28. The final detail matters: tie all sutures under slight tension so that when cut, the anoplasty retracts into proper position 4:48. If you tie without tension, the mucosa will evert and the patient will have persistent mucosal ectropion 4:48. If you tie too tight, you will see ischemia at the suture line within minutes 4:48.

The principle that unifies the technique

Every step in this repair serves the same goal: restore a flush mucocutaneous junction that allows the sphincter to close without creating circumferential scarring that will stenose 1:35 2:47 4:48. The selective approach — addressing only the prolapsing segment, mobilizing just enough, and setting tension carefully — reflects experience with the complications that follow more aggressive repairs 1:35 1:47 4:48. The patient who develops a tight stricture after prolapse repair has traded one functional problem for a worse one.