Spina Bifida
Neural tube defect causing incomplete spinal canal closure with variable paralysis
ICD-10: Q05.9 · congenital condition
Spina bifida is a neural tube defect (NTD) resulting from incomplete closure of the neural tube during the third to fourth week of embryonic development. It encompasses a spectrum of conditions: spina bifida occulta (a bony defect without neural involvement, usually asymptomatic), meningocele (protrusion of meninges without neural tissue), and myelomeningocele (MMC) — the most severe and common form, in which the spinal cord and nerve roots protrude through the bony defect in a sac on the baby's back. Neural tissue exposed to amniotic fluid during fetal development suffers progressive damage, causing motor paralysis and sensory loss below the defect level at birth. Myelomeningocele occurs at an incidence of approximately 3 per 10,000 live births in the United States. Folic acid supplementation before conception and in early pregnancy reduces the risk by approximately 70%. Maternal diabetes, obesity, and antiepileptic drug use (particularly valproic acid) increase risk. The condition is associated with Chiari II malformation (hindbrain herniation) in nearly all MMC cases, hydrocephalus requiring shunting in 80–90%, and tethered cord syndrome. Myelomeningocele repair is performed within 24–72 hours of birth to prevent infection and limit further neural damage. Fetal repair (in utero MMC closure between 19 and 26 weeks gestation) — shown in the landmark MOMS trial to reduce shunting rates and improve motor outcomes — is now offered at specialized fetal surgery centers. Lifelong multidisciplinary management addresses paralysis, bladder and bowel dysfunction, orthopedic complications, hydrocephalus, and educational and cognitive needs.
Anatomy & Pathology
During weeks 3–4 of embryonic development, the flat neural plate folds inward to form the neural tube, which eventually becomes the brain and spinal cord. Closure normally begins in the cervical region and proceeds bidirectionally. Failure of closure in the caudal portion — the lumbosacral end — produces the open myelomeningocele. In this defect, the vertebral arches fail to fuse posteriorly, the meninges herniate outward, and neural elements are tethered and exposed at the skin surface.
Symptoms
- Paralysis or weakness of the legs at and below the defect level (visible at birth)
- Sensory loss below the lesion — risk of pressure injuries and burns
- Neurogenic bladder and bowel: urinary retention, incontinence, constipation
- Hydrocephalus from associated Chiari II malformation (affects 80–90%)
- Tethered cord causing progressive neurological loss with growth
- Orthopedic deformities: clubfoot, hip dysplasia, scoliosis
- Cognitive and learning differences in a subset of patients, particularly with shunted hydrocephalus
Causes & Risk Factors
- Folic acid deficiency during neural tube closure (3–4 weeks post-conception)
- Maternal valproic acid or carbamazepine use during embryogenesis
- Maternal diabetes mellitus and obesity
- Genetic predisposition — recurrence risk 3–5% after one affected child
- Hyperthermia during early pregnancy (fever or hot tub use)
Imaging Findings
Imaging studies are commonly used to identify findings associated with this condition. Results vary by individual; a qualified spine specialist interprets findings in the context of a full clinical evaluation.
MRI
- Pre- and postnatal MRI evaluates level of cord involvement, tethered cord, hydrocephalus, Chiari II malformation, and syringomyelia
- Chiari II (downward cerebellar herniation) is present in nearly all myelomeningocele patients
- Post-surgical MRI monitors for re-tethering after initial repair
CT Scan
- Head CT monitors hydrocephalus in patients with ventriculoperitoneal shunts
- Less commonly used for spine assessment — MRI preferred
- Used for orthopedic surgical planning of hip or foot deformity correction
X-Ray
- Lower extremity and spine X-rays assess scoliosis (present in >50% of myelomeningocele patients), hip dislocation, and clubfoot deformities
- Spine deformities are common and require longitudinal monitoring through growth
- Hip surveillance is critical as subluxation is common at higher neurological levels
Who Is Commonly Affected
The following patterns are commonly associated with this condition based on published population studies. Individual presentation varies; these figures are informational only.
Peak Age Range
Congenital condition diagnosed prenatally via ultrasound or at birth
Gender Distribution
Slightly more common in females for myelomeningocele; overall roughly equal between sexes
Estimated Prevalence
Approximately 3.05 per 10,000 live births in the US; declining due to folic acid supplementation and prenatal diagnosis
Treatment Options
Conservative
- Clean intermittent catheterization (CIC) for neurogenic bladder — primary bladder management from infancy
- Orthotics (AFOs) and physical therapy for ambulation maximization based on lesion level
- Bowel management program: timed evacuation, dietary fiber, laxatives
Surgical
- Myelomeningocele closure within 24–72 hours of birth (or fetal surgery at 19–26 weeks at specialized centers)
- Ventriculoperitoneal (VP) shunt or endoscopic third ventriculostomy (ETV) for hydrocephalus
- Tethered cord untethering surgery when progressive neurological deterioration occurs with growth
When to see a spine specialist
Spina bifida is diagnosed prenatally by maternal AFP screening and anatomy ultrasound, or at birth for undiagnosed cases. Any child with known spina bifida who develops new weakness, new scoliosis, worsening bladder function, or signs of Chiari (stridor, apnea, upper extremity weakness) requires urgent neurosurgical evaluation for shunt malfunction, tethered cord, or Chiari decompensation.
Specialists Who Treat Spina Bifida
Find a specialist who treats spina bifida
NPI-verified spine surgeons in your city.
- Austin, TX
- Charlotte, NC
- Chicago, IL
- Columbus, OH
- Dallas, TX
- Denver, CO
- Fort Worth, TX
- Houston, TX
- Indianapolis, IN
- Jacksonville, FL
- Los Angeles, CA
- Nashville, TN
- New York, NY
- Philadelphia, PA
- Phoenix, AZ
- San Antonio, TX
- San Diego, CA
- San Francisco, CA
- San Jose, CA
- Seattle, WA
Find a spine specialist near you
Browse NPI-listed spine surgeons and neurosurgeons who treat spina bifida. Filter by location, insurance, and availability.
Search spine specialists →Looking for a treatment facility?
Search hospitals, ASCs, and imaging centers by zip code.
Questions to Ask Your Doctor
Bring these questions to your next appointment about spina bifida.
- 1
What type of spina bifida does my child have — myelomeningocele, meningocele, or a skin-covered form — and what does that mean for function?
- 2
What neurological level is affected, and what motor and sensory function can we realistically expect?
- 3
What is the recommended schedule for urological monitoring to prevent kidney damage?
- 4
Is prenatal surgery an option, and how do outcomes compare to postnatal closure?
- 5
What mobility aids, orthotics, and therapies are recommended to maximize function and independence?
Research Evidence
No studies reviewed yet for this condition. Check back soon — our evidence pipeline runs nightly.
Clinical Evidence
Frequently Asked Questions
Can spina bifida be detected before birth?
Yes. Maternal serum alpha-fetoprotein (AFP) screening at 15–20 weeks gestation is elevated in open neural tube defects. Second-trimester anatomy ultrasound detects the characteristic "lemon sign" (scalloped frontal bones) and "banana sign" (Chiari II cerebellar herniation) with high sensitivity. Amniocentesis can confirm elevated amniotic AFP and acetylcholinesterase. Fetal MRI provides detailed anatomical characterization. Prenatal diagnosis allows planning of delivery at a center capable of immediate neonatal surgical closure and referral to a fetal surgery program if criteria for fetal repair are met.
What level of spina bifida allows walking?
Ambulatory potential is strongly predicted by lesion level. Sacral-level lesions (S2–S5): community ambulation with minimal or no assistive devices. Low lumbar (L4–L5): community ambulation with orthotics (AFOs). Mid-lumbar (L3): household ambulation with forearm crutches and AFOs; wheelchair for community distances. High lumbar (L1–L2) and thoracic levels: primarily wheelchair users. Even non-ambulatory individuals benefit from standing and therapeutic ambulation for bone density, urodynamics, and pressure relief.
Do adults with spina bifida have complications later in life?
Yes. Spina bifida is a lifelong condition with evolving medical needs. Adults face higher rates of shunt malfunction than children (shunts can function normally for years before failing). Tethered cord re-tethering causes progressive neurological decline in adulthood. Urological complications — renal damage from chronic neurogenic bladder — are a major source of late morbidity and require continued urological surveillance. Obesity, depression, social isolation, and reduced employment are common. Transition from pediatric to adult care requires multidisciplinary coordination.