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.
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:
| Pattern | Frequency | Implications |
|---|---|---|
| DO + DSD | Common | High-pressure storage → hostile bladder; requires aggressive early pressure reduction |
| DO + incompetent sphincter | Common | Leaks protect upper tracts but cause incontinence |
| Areflexic detrusor + incompetent sphincter | Frequent | Retention + stress leakage; overflow pattern |
| Areflexic + coordinated sphincter | Less common | Retention 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
- Intradetrusor onabotulinumtoxinA — FDA-approved down to age 5; effective for neurogenic DO with hostile bladder.[1]
- Augmentation cystoplasty — the reconstructive foundation. Ileum standard; ileocecum when continent cutaneous reservoir is desired.
- 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).
- Bladder-neck reconstruction / closure / AUS — for intrinsic sphincter deficiency. Options: bladder-neck sling (pediatric), bladder-neck reconstruction (Young-Dees-Leadbetter, Kropp, Pippi-Salle), AUS in selected older children / adults, or bladder-neck closure when CIC-through-channel is established and outlet leakage is intolerable.
- MACE (antegrade continence enema) channel — appendix or cecostomy for antegrade large-volume bowel irrigation. Often performed concurrently with urologic reconstruction.
- 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.
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