Tethered Cord Syndrome

What it is

Normally the spinal cord hangs freely inside the spinal canal and can glide a little as the body moves and grows. In a tethered cord, the lower end of the cord is anchored down — by scar tissue, a fatty growth, a tight filum (the thread at the cord’s tip), or a prior spina bifida — so it cannot move and gets stretched. That stretch, especially during growth, can gradually affect how the lower nerves work.

What it feels like

Signs vary by age. In children, there may be leg weakness or differences between the legs, foot deformity, changes in walking, bladder or bowel difficulties, back or leg pain, or a skin marking low on the back (a dimple, tuft of hair, or fatty lump). Adults more often notice progressive back or leg pain, numbness, or new bladder changes. The pattern of slow, progressive change is the clue.

How we diagnose it

An MRI shows the position of the cord and what is anchoring it, and an exam and bladder testing help gauge how the lower nerves are functioning. Putting these together tells me whether the cord is simply low-lying or truly tethered and causing problems.

How we treat it

When a tethered cord is causing symptoms or there are signs that it is beginning to, the treatment is a surgery to release the anchor (untethering) and free the cord, which aims to stop further decline and protect function. When findings are mild or uncertain, careful monitoring — watching for any progression — is sometimes the right first step. The plan depends on age, symptoms, and what the imaging shows.

The science — for the curious

Timing is the central issue in a tethered cord: the goal of surgery is to protect function before it is lost, because nerve function that declines from prolonged stretch may not fully return. That is why progressive symptoms — or clear signs that trouble is starting — push toward releasing the cord, while a stable, symptom-free situation can often be watched. Growth is a key driver, which is why children are followed especially closely.

Learn more

Centers for Disease Control and Prevention — About Spina Bifida: cdc.gov

MedlinePlus Genetics — Spina Bifida: medlineplus.gov

This handout is general education about a common condition and does not replace the personalized advice we discuss in clinic. If anything here does not match what we talked about, what we talked about wins — please ask me.