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Spina Bifida

Spina bifida (myelomeningocele) is the congenital NLUTD population that has most shaped reconstructive urology as a specialty. Virtually every major reconstructive technique in use today — clean intermittent catheterization as a care standard, augmentation cystoplasty, the Mitrofanoff principle, bladder-neck reconstruction, MACE for bowel management, and multidisciplinary transitional care — was refined in this population. Approximately 85% of children with myelomeningocele have NLUTD at birth, and the lesion level only imperfectly predicts the urodynamic phenotype, so every infant with spina bifida needs urodynamic evaluation.[2] The reconstructive urologist inherits these patients in one of two ways: in a lifelong pediatric→adult continuum at a spina-bifida center, or as transitioned young adults presenting with hostile bladders, failed prior reconstructions, fertility or pregnancy concerns, and pressure-injury or stone complications.

See Neurogenic Lower Urinary Tract Dysfunction for the general framework. The reconstructive ladder discussed below is detailed in the Treatment Atlas: Intradetrusor OnabotulinumtoxinA, Bladder Augmentation, Catheterizable Channels (Mitrofanoff / Monti), and the Artificial Urinary Sphincter for outlet incompetence.

Epidemiology​

  • US incidence ~1,500 births / year; prevalence reduced by periconceptional folate supplementation.
  • ~85% of myelomeningocele patients have NLUTD at birth.
  • Fetal MMC closure (MOMS trial) has improved neurologic outcomes but does not eliminate NLUTD risk — urodynamic follow-up remains mandatory.
  • Associated anomalies: Chiari II malformation, hydrocephalus (~85–90%, most VP-shunted), tethered spinal cord, neurogenic bowel, orthopedic deformities, sexual dysfunction, fertility issues.

Pathophysiology​

Unlike traumatic SCI, spina bifida NLUTD reflects a developmental, non-uniform cord lesion. The lesion level on imaging correlates only loosely with urodynamic phenotype — every infant with MMC requires urodynamic testing.[2]

Typical urodynamic patterns:

PatternFrequencyImplications
DO + DSDCommonHigh-pressure storage → hostile bladder; requires aggressive early pressure reduction
DO + incompetent sphincterCommonLeaks protect upper tracts but cause incontinence
Areflexic detrusor + incompetent sphincterFrequentRetention + stress leakage; overflow pattern
Areflexic + coordinated sphincterLess commonRetention dominant

Tethered cord can change urodynamics over time — new or worsening urinary / bowel symptoms in a growing spina-bifida child warrant re-imaging and neurosurgical consultation.

Initial Evaluation​

Standard at modern spina-bifida centers:

Newborn / infancy:

  • Renal ultrasound
  • VCUG (evaluate VUR)
  • Baseline urodynamics at 3–6 months of age (or earlier if hydronephrosis or poor emptying) — guides initiation of CIC and antimuscarinic therapy.[2]

Throughout childhood:

  • Urodynamics every 1–2 years (or with clinical change) until stable.
  • Renal US every 6–12 months.
  • Serum Cr / eGFR annually once age-appropriate.

Adolescence and transition:

  • Re-evaluate urodynamics annually or with symptom change.
  • Plan transition to adult urology with a named neuro-urology team.

Management — The Spina-Bifida Reconstructive Ladder​

Early childhood (CIC-based)​

  • CIC from infancy for hostile bladder, high PVR, or DSD — the single most effective intervention for upper-tract preservation. Parents and then patients are taught the skill.
  • Antimuscarinic (oxybutynin) added at low doses in infancy for DO or poor compliance.
  • Bowel program — essential and parallel to bladder care; neurogenic bowel management drives quality of life and continence.

Escalation when CIC + antimuscarinic fails​

  1. Intradetrusor onabotulinumtoxinA — FDA-approved down to age 5; effective for neurogenic DO with hostile bladder.[1]
  2. Augmentation cystoplasty — the reconstructive foundation. Ileum standard; ileocecum when continent cutaneous reservoir is desired.
  3. Continent catheterizable channel (Mitrofanoff) — concomitant with augmentation in most spina-bifida patients. Umbilical stoma allows CIC independence even in wheelchair-bound patients. Appendix (classic Mitrofanoff) or reconfigured ileum (Monti).
  4. Bladder-neck reconstruction / closure / AUS — for intrinsic sphincter deficiency. Options: bladder-neck sling (pediatric), AUS in selected older children / adults, or bladder-neck closure when CIC-through-channel is established and outlet leakage is intolerable.
  5. MACE (antegrade continence enema) channel — appendix or cecostomy for antegrade large-volume bowel irrigation. Often performed concurrently with urologic reconstruction.
  6. Ileal conduit / continent diversion — salvage for failed reconstructions.

Augmentation-cystoplasty specifics in spina bifida​

  • Ileum is the commonest segment; patch detubularized and anastomosed to bivalved bladder.
  • Need for concurrent Mitrofanoff — very common, especially in wheelchair-using patients.
  • Metabolic surveillance — acidosis, B12 deficiency, electrolyte derangement (annual labs).
  • Stone surveillance — bladder stones are common in augmented patients; annual imaging, bladder irrigations.
  • Malignancy surveillance — augmentation cystoplasty carries a long-term cancer risk (~1% at 10–20 years). Annual cystoscopy after 10 years is a reasonable approach; urine cytology of limited utility.

Tethered cord​

  • Any new urologic or bowel symptom change in a growing spina-bifida child should trigger MRI for tethered cord + neurosurgical consultation.
  • Untethering can stabilize or improve NLUTD but does not always restore function.

Transition to Adult Care​

The most vulnerable moment in a spina-bifida patient's life is the pediatric-to-adult care transition. Attrition at transition is the leading cause of late upper-tract deterioration and late diagnosis of reconstruction complications.

Best-practice transition elements:

  • Dedicated spina-bifida multidisciplinary clinics spanning both pediatric and adult populations.
  • Structured transition readiness assessment starting in adolescence.
  • Warm hand-off from pediatric urology to adult neuro-urology.
  • Continued surveillance protocol with no gaps.

Special Adult Reconstructive Issues​

Pregnancy​

  • Most women with spina bifida can carry to term; pregnancy requires a coordinated urologic-obstetric plan.
  • Augmentation / Mitrofanoff anatomy can be distorted by the gravid uterus; catheterization may need to shift (urethral catheter, then back to Mitrofanoff postpartum).
  • Mode of delivery: cesarean often preferred to protect reconstruction and because of sacral anatomy; individualized.
  • Higher UTI risk; lower threshold for treatment.

Sexual function and fertility​

  • Men — erectile dysfunction common; PDE5i first-line; prosthesis in refractory cases. Ejaculatory dysfunction; sperm retrieval (PESA/MESA/TESE) when needed.
  • Women — sexual function often preserved; sensation may be reduced below lesion.
  • Latex allergy — patients with spina bifida have high rates of latex allergy from early catheter exposure; always confirm and use latex-free equipment.

Bladder cancer in augmented spina bifida​

  • Risk rises after ~10 years.
  • Annual cystoscopy after that interval; prompt evaluation of hematuria, persistent irritative symptoms, or unexplained stone recurrence.

Obesity and reconstruction access​

  • Many spina-bifida adults have wheelchair-associated weight gain, which complicates urethral CIC access and makes a Mitrofanoff umbilical stoma highly valuable.

Clinical Correlations for the Reconstructive Urologist​

  • Urodynamics drive NLUTD decisions, not lesion level. Two infants with the "same" MMC level can have opposite phenotypes; treat the bladder you find, not the one you expected.
  • Hostile bladder → early CIC + antimuscarinic. Almost every long-term renal disaster in spina bifida was preventable by timely pressure reduction.
  • The augmentation + Mitrofanoff + MACE stack is the modern reconstructive foundation. Often performed in the same OR in adolescence to establish durable bladder, bowel, and continence programs before adulthood.
  • Transition care is a life-or-death issue. Patients who fall out of surveillance between pediatric and adult care present with advanced disease.
  • Tethered cord is the most important hidden driver of late decline. Re-image anyone with new symptoms.
  • Latex allergy is a surgical hazard — always flagged preoperatively.
  • A named spina-bifida program coordinating urology, neurosurgery, orthopedics, PM&R, GI, and gynecology improves every outcome domain. Align your practice with the nearest one if you see these patients sporadically.

See Also​

References​

1. Ginsberg DA, Boone TB, Cameron AP, et al. "The AUA/SUFU Guideline on Adult NLUTD: Treatment and Follow-Up." J Urol. 2021;206(5):1106–1113. doi:10.1097/JU.0000000000002239

2. Diamond DA, Chan IHY, Holland AJA, et al. "Advances in Paediatric Urology." Lancet. 2017;390(10099):1061–1071. doi:10.1016/S0140-6736(17)32282-1