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Dr. Todd Ponsky

Pediatric Surgery · View profile →

Panel Discussion and Case Presentation Part I: Pediatric Bowel Management 2013

Video Published 2019-01-11 Updated 2026-06-10

Timestops (4)

Topic Overview

A panel discussion on prognostic indicators for bowel control in patients with anorectal malformations, focusing on sacral ratio calculation as a predictive tool. The speakers demonstrate how to measure sacral ratio on AP and lateral radiographs, establishing that a ratio of 0.7 or above indicates good prognosis while 0.4 or below predicts fecal incontinence. Through interactive case discussions, they emphasize that fecal incontinence alone is not an indication for permanent colostomy, that presacral masses must be ruled out even in favorable malformations like rectal perineal fistula, and that bowel management with enemas is the preferred approach for incontinent patients who can form solid stool.

Key Takeaways

  • Sacral ratio ≥0.7 predicts good bowel control; ≤0.4 predicts lifelong fecal incontinence requiring enema management. (1:50)
  • Fecal incontinence alone is not an indication for permanent colostomy; only inability to form solid stool warrants it. (5:38)
  • Always rule out presacral mass before prognosticating—even favorable malformations like rectal perineal fistula worsen with hemisacrum. (9:54)
  • Patients report better quality of life with bowel management programs than with permanent colostomy. (6:25)

Inside this episode

Kai, the Library's AI content creator, listened to this episode and mapped who's speaking, the chapters, key claims, and cases. Every item links to the exact moment in the recording.

AI-enriched

Who's speaking

  • Speaker 1 — guest
  • Speaker 2
  • Speaker 3 — host
  • Speaker 4 — guest

Chapters

  • 0:00Sacral Ratio Calculation Technique — Detailed instruction on measuring sacral ratio on AP and lateral radiographs using four reference lines, with interpretation thresholds of 0.7 for good prognosis and 0.4 or below for fecal incontinence.
  • 4:14Case Discussion: Indications for Permanent Stoma — Interactive case exploring when permanent colostomy is indicated, establishing that incapacity to form solid stool is the only indication, not fecal incontinence, low sacral ratio, or complex malformations.
  • 7:19Case Discussions: Prognosis by Malformation Type — Series of cases covering prognosis for Down syndrome patients (80%), rectal bladder neck fistula (15%), and rectal perineal fistula with hemisacrum, emphasizing the importance of detecting presacral masses.
  • 10:54Cloacal Exstrophy Prognosis — Brief discussion establishing that while most cloacal exstrophy patients are fecally incontinent due to tethered cord, myelomeningocele, or abnormal sacrum, not all patients are incontinent.

Key claims

  • 1:43In normal patients the sacral ratio is 0.7 or more — Speaker 1
  • 1:50A sacral ratio of 0.7 or more means good prognosis for bowel control — Speaker 1
  • 2:35When sacral ratio is 0.4 or less, the patient will be fecally incontinent regardless of the type of malformation — Speaker 1
  • 2:56We have never seen a patient with a sacral ratio of less than 0.4 that is fecally continent — Speaker 1
  • 2:56A patient with sacral ratio less than 0.4 will need enemas for life — Speaker 1
  • 5:38The only indication for a stoma for life is incapacity to form solid stool — Speaker 1
  • 5:59Patients with bad prognosis for bowel control are not candidates for stoma for life — Speaker 1
  • 6:25Patients subjected to bowel management tell us that the quality of life with bowel management is much better than the quality of life of having a colostomy — Speaker 4
  • 6:55With incapacity to form solid stool there is no bowel management — Speaker 4
  • 7:57Patients with Down syndrome and anorectal malformation have 80% chance of bowel control — Speaker 1
  • 8:01Most patients with Down syndrome have anorectal malformation without fistula — Speaker 1
  • 8:55Only 15% of patients with rectal bladder neck fistula have bowel control — Speaker 1
  • 9:01Rectal bladder neck fistula is a bad malformation in terms of prognosis for bowel control — Speaker 1
  • 9:36Rectal perineal fistula is the malformation with the best prognosis — Speaker 1
  • 9:49Good prognosis depends upon having a good operation, good sacrum, no tethered cord — Speaker 1
  • 9:54It is important to rule out a presacral mass before discussing prognosis for bowel control — Speaker 1
  • 10:19Hemisacrum indicates that the patient has a presacral mass — Speaker 1
  • 10:19If a patient has rectal perineal fistula but also has hemisacrum and presacral mass, the prognosis for bowel control changes completely and cannot be called good — Speaker 1
  • 10:54Many patients born with perineal fistula had terrible problems because the presacral mass was not detected and not treated when surgeons did not take an x-ray film of the sacrum — Speaker 4
  • 11:55The majority of patients with cloacal exstrophy will be fecally incontinent because of high numbers of tethered cord, myelomeningocele, or bad sacrum — Speaker 1
  • 11:55There are a few patients with cloacal exstrophy that are fecally continent — Speaker 1

Cases discussed

  • 9:06Newborn with rectal perineal fistula and hemisacrum on radiograph

Open questions

  • Is it necessary for gastroenterologists to know what kind of anorectal malformation the patient has?
This episode was analyzed and enriched by Kai, the Library's AI content creator. Every item links to the moment it comes from — click a timestamp to listen in context.
Written for:

Sacral Ratio and Presacral Anatomy: Prognostic Markers That Determine Bowel Management Strategy

The episode's teaching points arranged as a structured lesson, building from the basics up to the finer points. Written by Kai from the episode transcript and reviewed before publishing.

For the care team · Teaching arc · AI-written, human-reviewed

Quantifying the Sacrum to Predict Continence

The sacral ratio is a radiographic measurement that predicts bowel control capacity with remarkable reliability. On both AP and lateral sacral films, four lines are drawn: the first along the direction of the sacrum, the second at the top of the iliac crest, the third where the sacrum last joins the iliac bones, and the fourth at the last identifiable sacral bone 1:43. The ratio is calculated by dividing the distance between the second and third lines by the distance between the first and second lines. In normal patients the sacral ratio is 0.7 or more 1:43, and a ratio at or above this threshold means good prognosis for bowel control 1:50.

When the sacral ratio falls to 0.4 or less, the patient will be fecally incontinent regardless of the type of malformation 2:35. The discussants emphasized that they have never seen a patient with a sacral ratio below 0.4 achieve fecal continence 2:56. This is not a relative contraindication to reconstruction — it is an absolute predictor. These patients will need enemas for life 2:56, but that does not mean they need a permanent stoma.

The Single Indication for Permanent Colostomy

The only indication for a stoma for life is incapacity to form solid stool 5:38. Fecal incontinence, low sacral ratio, unfavorable malformation type — none of these justify permanent fecal diversion 5:59. Patients subjected to bowel management report that their quality of life with a structured enema regimen is much better than life with a colostomy 6:25. With incapacity to form solid stool there is no bowel management 6:55 — liquid stool without control is unmanageable — but for patients who can form stool, even those with poor prognosis for spontaneous continence, bowel management is the answer, not a permanent stoma.

Malformation Type Modifies but Does Not Determine Prognosis

Patients with Down syndrome and anorectal malformation have an 80% chance of bowel control 7:57, in part because most have anorectal malformation without fistula 8:01. At the opposite end of the spectrum, only 15% of patients with rectal bladder neck fistula achieve bowel control 8:55 — it is a bad malformation in terms of prognosis 9:01. Rectal perineal fistula is the malformation with the best prognosis 9:36, but good prognosis depends upon having a good operation, good sacrum, and no tethered cord 9:49.

Hemisacrum Signals Hidden Pathology

It is important to rule out a presacral mass before discussing prognosis for bowel control 9:54. Hemisacrum on plain film indicates that the patient has a presacral mass 10:19. If a patient has rectal perineal fistula but also has hemisacrum and presacral mass, the prognosis for bowel control changes completely and cannot be called good 10:19. Many patients born with perineal fistula had terrible problems because the presacral mass was not detected and not treated when surgeons did not take an x-ray film of the sacrum 10:54. The lesson: obtain sacral imaging before counseling families and before operating, even in favorable malformations.

Complex Malformations Carry High Incontinence Risk but Not Absolute

The majority of patients with cloacal exstrophy will be fecally incontinent because of high numbers of tethered cord, myelomeningocele, or bad sacrum 11:55. But there are a few patients with cloacal exstrophy that are fecally continent 11:55. The discussants' point: even in the most severe malformations, continence is not impossible, and the decision tree still begins with the sacral ratio and the capacity to form solid stool, not with the diagnosis alone.

The Framework

The teaching arc here is a decision algorithm built on measurable anatomy. Sacral ratio below 0.4 predicts incontinence but not the need for permanent diversion. Inability to form solid stool is the only absolute indication for colostomy. Malformation type refines the estimate but does not override sacral anatomy. And hemisacrum, even in a favorable malformation, signals presacral pathology that changes everything. The discussants returned repeatedly to this point: prognosis is not guesswork — it is radiographic measurement, anatomic assessment, and honest counseling about what bowel management can and cannot achieve.

Takeaways from this story

  • Sacral ratio below 0.4 predicts fecal incontinence but not the need for permanent colostomy — these patients are candidates for bowel management.
  • Hemisacrum on plain film indicates a presacral mass that changes prognosis even in favorable malformations like rectal perineal fistula.
  • The only indication for permanent stoma is incapacity to form solid stool — not low sacral ratio, not unfavorable malformation type.
  • Rectal bladder neck fistula has only 15% bowel control rate; Down syndrome with anorectal malformation has 80% — malformation type matters.

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