What is Tethered Cord?
Normally, the spinal cord hangs loosely in the spinal canal and moves freely with growth and activity. In Tethered Cord Syndrome, the cord is anchored by tissue attachments, which restricts this movement. This results in tension and stretching of the cord, leading to potential nerve damage and impaired blood flow.
It is characterized by an abnormally low position of the conus medullaris (the bottom of the cord) or a thickened, inelastic filum terminale (the ligament that connects the cord to the tailbone).
Symptoms across Ages
Pediatric Presentation
In children, signs are often visible on the physical body or during growth spurts:
- 1
Skin Lesions: Dimples, tufts of hair, fatty tumors (lipomas), or birthmarks on the lower back.
- 2
Physical Changes: Development of scoliosis (curved spine) or gait abnormalities (walking on toes/tripping).
- 3
Urological: Frequent urinary tract infections or delayed potty training.
Adult Presentation & "3-B" Pain
Pain aggravated by Bending at the waist, Buddha-sitting (cross-legged), or Baby-holding (carrying heavy items).
Progressive leg weakness, numbness, or loss of bowel/bladder control.
Causes & Risk Factors
Associated with Spina Bifida (Myelomeningocele), a fatty filum terminale (thickened ligament), or Lipomyelomeningocele (fatty tumors in the spinal canal).
Can occur later in life due to spinal cord injuries, tumors, or the formation of scar tissue (adhesions) following previous spinal surgeries.
Diagnosis & Imaging
Early diagnosis is vital to prevent permanent neurological loss. Methods include:
- MRI (Gold Standard): The primary tool to visualize the conus medullaris and the filum terminale.
- Ultrasound: Preferred for infants under 3 months of age, as their vertebrae are not yet fully ossified.
- Myelogram/CT: Utilized if MRI is not definitive or for detailed surgical planning.
Treatment: Surgical Untethering
The standard treatment for symptomatic patients is surgical intervention.
A neurosurgeon performs a laminectomy to access the spinal cord and carefully releases (cuts) the tissue attachments or the thickened filum terminale to let the cord move freely.
In adults, if symptoms are minor and stable, a doctor may recommend "watchful waiting" with regular imaging and neurological checks.
Prognosis
Early surgical intervention offers a high success rate in halting the progression of symptoms and can often reverse motor or sensory deficits.
It is possible for the cord to "re-tether" over time due to scar tissue formation from the surgery. Long-term follow-up with a neurosurgeon is essential, especially during pediatric growth spurts.
