Posterior cord syndrome is the one that's easiest to underestimate — including by the people who have it. You can move. You can feel pain, temperature, and light touch. On the surface, everything looks like it works. And yet you can't reliably tell where your own arms and legs are without looking at them, which makes standing, walking, and using your hands strangely difficult and unsafe.
It's the rarest of the four classic incomplete spinal cord syndromes, and it gets missed precisely because movement is preserved. This guide explains what's actually happening, why the loss of "position sense" matters so much, and what rehab and daily life look like when your body can move but can't feel where it is.
What Posterior Cord Syndrome Is
Posterior cord syndrome is an incomplete injury to the back of the spinal cord — specifically the dorsal columns, the pathways that carry position sense, vibration, and fine, discriminative touch up to the brain. The front of the cord, which carries movement and pain/temperature, is usually spared.
Because the dorsal columns are what tell your brain where your body is in space, damaging them produces a very particular problem: your muscles work, but they're operating half-blind. The technical name for the result is sensory ataxia — uncoordinated, unsteady movement caused not by weakness but by missing sensory information.
What's Lost, What's Spared
Below the level of the injury:
- Lost: proprioception (the sense of where your limbs are), vibration sense, and fine two-point/discriminative touch.
- Preserved: voluntary movement, and the sensations of pain, temperature, and crude touch.
This is the near-mirror image of anterior cord syndrome, where movement and pain/temperature are lost but position sense is kept. In posterior cord syndrome the trade runs the opposite way — you keep the movement and the protective pain sensation, but lose the background sense of position that makes movement smooth and safe.
What Causes It
Unlike most spinal cord injuries, posterior cord syndrome is usually not caused by trauma. The more common causes damage the dorsal columns from the inside or by slow compression:
- Posterior spinal artery ischemia — loss of blood supply to the back of the cord (rare, because two arteries supply it).
- Vitamin B12 deficiency — causes degeneration of the dorsal columns (subacute combined degeneration).
- Multiple sclerosis and other demyelinating disease.
- Tumors or a herniated disc pressing on the back of the cord.
- Tabes dorsalis — a late complication of untreated syphilis that classically attacks the dorsal columns.
- Trauma — the least common cause, usually a hyperextension injury.
The cause matters enormously here because several of these are treatable or reversible if caught early — a B12 deficiency corrected with supplementation, an infection treated, a tumor or disc decompressed. That makes getting the right diagnosis especially important.
How Common It Is
Posterior cord syndrome is the least common of the incomplete syndromes — estimates put it at roughly 2% or less of spinal cord injuries. It also tends to affect an older age group on average (one series reported an average onset around age 62), largely because most of its causes are medical rather than traumatic.
What It Feels Like
An unsteady, wide-based walk. The hallmark is sensory ataxia: a gait that's uncoordinated and unsteady, often with a wider stance and irregular foot placement, because you can't feel where your feet are landing. Many people watch their feet constantly to compensate.
Falling apart in the dark. A classic feature is that balance is much worse when you close your eyes or the lights go out — the "Romberg" sign your clinician may test. When vision can't fill in for the missing position sense, coordination collapses. Nighttime trips to the bathroom are a real fall risk.
Clumsy hands. If the injury is high enough, fine tasks that rely on feeling where your fingers are — buttoning, handling coins, typing without looking — become slow and error-prone even though grip strength is fine.
Pins and needles. Paresthesia (tingling, prickling) below the level of the injury is common. And like any SCI, there can be an early phase of spinal shock, along with the possibility of spasticity, neuropathic pain, and bladder changes.
How It's Diagnosed
Posterior cord syndrome is genuinely easy to miss — because strength is normal, a quick exam can look reassuring. It's found by specifically testing the things that are lost: vibration (with a tuning fork), joint position sense (moving a toe or finger up or down with your eyes closed), and balance with eyes closed (the Romberg test). Careful sensory testing during the ASIA/ISNCSCI exam is what catches it.
MRI images the back of the cord and looks for a cause (tumor, disc, demyelination, or signal change from ischemia), and blood tests — especially vitamin B12 — are important because a reversible cause changes everything. If the story fits, testing for syphilis and other specific causes may follow.
Treatment & Rehab
Treat the cause first. This is the syndrome where the underlying cause most often has a specific fix: vitamin B12 replacement for a deficiency, surgical decompression (such as a laminectomy) for a compressing tumor or disc, treatment of an infection, or disease-specific therapy for MS. Addressing the cause early gives the dorsal columns their best chance.
Rehabilitation is built around balance and retraining. Because the problem is missing sensory feedback rather than weakness, therapy focuses on:
- Using vision to compensate — deliberately watching limb and foot placement, and training safer movement strategies.
- Balance and gait training — task-specific, higher-intensity walking practice, which the evidence supports for improving locomotor function after incomplete SCI.
- Visual and sensory feedback tools — including virtual-reality-based training, which has good evidence for augmenting the feedback your body can no longer supply.
- Fall prevention — home lighting, handrails, removing trip hazards, and safe routines for night-time and low-light situations.
Recovery & Prognosis
Because posterior cord syndrome is so rare, there's limited long-term data specific to it — but a few things can be said honestly.
Incomplete injuries generally carry a more favorable outlook than complete ones, and across incomplete SCI as a group, a substantial share of people regain the ability to walk within the first year, with most functional recovery settling in by around 18 months. When the cause is reversible — a corrected B12 deficiency, a decompressed disc — the outlook can be considerably better if it's caught early.
The lasting challenge is usually the ataxia. Even with good recovery, the loss of position sense tends to be the piece that lingers, so a lot of the long-term work is about compensation and safety rather than "getting sensation back." That's not defeat — people adapt, and vision-based strategies become second nature — but it's the honest shape of recovery here.
What to Fight For
Make sure the cause was actually chased down. The single most important thing in posterior cord syndrome is not missing a treatable cause — B12, infection, MS, a compressing lesion. If that workup didn't happen, ask for it.
Get rehab that targets balance and coordination, not just strength. You may not be weak — so generic strengthening isn't the point. Push for gait, balance, and sensory-feedback training. See Physical Therapy & Rehab.
Take fall prevention seriously. This syndrome's biggest day-to-day danger is falling, especially in the dark. Treat lighting, handrails, and night-time routines as medical necessities, not home-decor choices.
Don't dismiss the parts that don't show. "You can walk, you're fine" misses the point — the disability lives in coordination, safety, and fatigue. It's real even when it isn't visible.
Living With It
Two safety themes define daily life with posterior cord syndrome, and both have practical answers.
Protect skin you can't fully monitor. Even though pain and temperature are preserved, the loss of fine sensation plus reduced mobility can still lead to pressure injuries — so a daily skin check and regular position changes are still worth building into your routine.
The reassuring flip side: you keep the two things that protect you most — the ability to move and the ability to feel pain and heat. Rehabilitation is largely about teaching your eyes and your remaining senses to do the job the dorsal columns used to do automatically, and most people get steadily better at it with practice.
Key Takeaways
- Posterior cord syndrome is the rarest incomplete SCI — an injury to the dorsal columns at the back of the cord.
- Below the injury: position sense, vibration, and fine touch are lost, while movement, pain, and temperature are preserved.
- The result is sensory ataxia — unsteady, uncoordinated movement that gets much worse in the dark, because you must use vision to replace lost position sense.
- Causes are mostly non-traumatic — B12 deficiency, MS, ischemia, tumor or disc, tabes dorsalis — and several are treatable if caught early.
- It's easy to miss because strength is normal; diagnosis needs careful testing of vibration, position sense, and balance (Romberg), plus MRI and a B12 level.
- Rehab centers on balance, gait, vision-based compensation, and fall prevention rather than strengthening.
- Lighting and fall prevention are core safety measures — the biggest everyday risk is falling in low light.
Sources & Further Reading
This page draws on published clinical guidance and the lived experience of the SCI community, including:
- Posterior Cord Syndrome — Physiopedia
- Posterior cord syndrome: demographics and rehabilitation outcomes — McKinley, Hills & Sima, Journal of Spinal Cord Medicine (2021)
- International Standards for Neurological Classification of SCI (ISNCSCI) — American Spinal Injury Association
- Spinal Cord Injuries — MedlinePlus (U.S. National Library of Medicine)
SCI.help articles are information, not medical advice. Posterior cord syndrome is rare and highly individual — practice varies by cause, injury level, provider, and institution. Always confirm specifics with your own care team.