Anterior cord syndrome is one of the harder patterns to be handed — and one of the more confusing. Below the level of the injury you can't move and you can't feel pain or temperature, yet you can still tell where your limbs are in space with your eyes closed. Movement gone, one kind of sensation gone, another kind perfectly intact. It doesn't match anyone's mental picture of a spinal cord injury.
It also carries the most guarded outlook of the four classic incomplete syndromes. That's the honest starting point, and this guide won't pretend otherwise. But "guarded" is not "hopeless" — the preserved sensation is a real asset in rehab, recovery does happen, and understanding what's going on helps you and your family ask the right questions at the right time.
What Anterior Cord Syndrome Is
Anterior cord syndrome — also called anterior spinal artery syndrome or ventral cord syndrome — is an incomplete injury to the front two-thirds of the spinal cord. Most often it isn't caused by a direct blow at all, but by a loss of blood supply to that part of the cord. The front of the cord is where the movement pathways and the pain-and-temperature pathways run; the back of the cord, which carries position sense and vibration, usually survives.
That anatomy produces a very specific combination of losses below the level of injury, on both sides of the body:
- Loss of movement — weakness or paralysis below the injury (the motor pathways run in the front of the cord).
- Loss of pain and temperature — you may not feel a cut, a burn, or cold below the injury.
- Preserved position sense, vibration, and fine touch — you can still tell where your limbs are and feel deep pressure and vibration, because the back of the cord is spared.
What's Lost, What's Spared
The strange, defining feature of anterior cord syndrome is that you keep the sense of where your body is, but lose the ability to move it or to feel pain in it. People describe being able to close their eyes and know exactly where their leg is positioned — while being unable to lift it, and unable to feel the nurse pressing a pin against it.
This is the near-mirror image of posterior cord syndrome, where movement is preserved but position sense is lost. In anterior cord syndrome the trade runs the other way — and it's usually the harder of the two, because motor loss and the inability to feel injury both come with it.
Because the injury is typically caused by blood-supply loss across the width of the cord, the pattern is usually fairly symmetric — both sides of the body below the injury are affected — rather than one-sided like Brown-Séquard syndrome.
Why Blood Supply Is the Key
The spinal cord is fed by three main arteries running down its length: one anterior spinal artery in front, and two smaller posterior spinal arteries behind. The single anterior artery supplies the front two-thirds of the cord — a large territory kept alive by one relatively vulnerable vessel.
When that artery's flow is interrupted — by a clot, by prolonged low blood pressure, by injury to the aorta it branches from, or by bone or disc pressing on it — the front of the cord is starved of oxygen and can infarct (the spinal-cord equivalent of a stroke). The back of the cord, fed by its own separate arteries, is often spared. That single-artery vulnerability is the whole reason the pattern exists.
What Causes It
Causes split into vascular (blood-supply) problems and things that physically compress the front of the cord.
Vascular causes are the classic ones: surgery or disease of the aorta (aneurysm repair, dissection — the artery that feeds the cord branches off the aorta), a prolonged drop in blood pressure or blood flow (during cardiac arrest, major surgery, or severe blood loss), blood clots and emboli, atherosclerosis, vasculitis, and — rarely — a fragment of disc material entering the circulation (fibrocartilaginous embolism).
Compressive and traumatic causes include a burst fracture that drives bone backward into the front of the cord, an acute disc herniation, and hyperflexion injuries of the neck. In these cases the front of the cord is crushed directly rather than starved of blood.
As with the other syndromes, the cause drives everything that follows — a compressing bone fragment may need urgent surgery, while an aortic or blood-pressure cause calls for a very different response.
How Common It Is
Anterior cord syndrome is uncommon, but it's the most frequent of the spinal cord injuries caused by loss of blood supply. Exact figures are hard to pin down because it's rare and reported mostly in case series — but as one of the four classic incomplete patterns, it's far less common than central cord syndrome, and it can strike at any age depending on the cause (a young person after a burst fracture; an older adult after aortic surgery).
What It Feels Like
The experience is dominated by three things happening at once below the level of injury:
You can't move — but you can feel where you are. The preserved position sense is real and, in rehab, genuinely useful: your nervous system still knows where the limb is, which is one less thing to relearn. The frustration is that knowing where your leg is doesn't help you lift it.
You can't feel pain or temperature. This is the sensation that protects you from injury, and it's gone below the level — on both sides. A burn or a wound can happen without any warning signal.
Your autonomic systems are often affected. Anterior cord injuries commonly bring neurogenic bladder and bowel changes, blood-pressure swings, and effects on sexual function. If your injury is at T6 or above, learn the signs of autonomic dysreflexia early.
As with any spinal cord injury, the acute picture can be muddied by spinal shock — an early, temporary shutdown that can make everything look flaccid before the true pattern emerges — and spasticity and neuropathic pain may develop later.
How It's Diagnosed
The diagnosis comes from the neurological exam plus imaging that shows the cause. On exam, the tell is the split between lost movement and pain/temperature versus preserved position sense and vibration — captured in the ASIA classification.
MRI is the key study. In a vascular anterior cord injury it often shows a bright signal in the front of the cord (sometimes described as an "owl's eyes" or "snake eyes" pattern on the cross-sectional view), and it can reveal a compressing fracture, disc, or a problem with the aorta. CT is used to see bone injury after trauma, and when a vascular cause is suspected the workup extends to the heart and aorta to find the source.
The Acute Phase & Treatment
There is no treatment that reverses the infarct itself, so care is aimed at stopping further damage, fixing the cause, and protecting the cord's blood supply.
Protect blood flow to the cord. Because the injury is about perfusion, the team often works to keep your blood pressure up so the surviving cord tissue stays supplied — sometimes deliberately targeting a higher-than-normal pressure for a period, and in some aortic cases draining spinal fluid to reduce pressure around the cord.
Treat the cause. If bone or disc is compressing the front of the cord, surgical decompression and stabilization may be urgent. If the cause is the aorta, a clot, or blood pressure, the response is medical and directed at that source.
About steroids. High-dose steroids are not routinely recommended for spinal cord injury — the benefit is small and the risks (infection especially) are real. Practice varies, so ask your team their reasoning in your case.
Then rehabilitation. Once you're stable, the focus shifts to physical and occupational therapy, bladder and bowel management, and pain and spasticity care — the long work of building the most function and independence possible.
Recovery & Prognosis
Here's the honest part. Anterior cord syndrome has the most guarded prognosis of the four classic incomplete syndromes — poorer than central cord, posterior cord, or Brown-Séquard. Meaningful motor recovery happens in a minority of people, and a lack of any improvement in the first 24 hours is a discouraging sign.
But two things are worth holding onto, and they're true rather than sugar-coating:
Preserved position sense is a rehab advantage. Because the back of the cord survives, your body still knows where it is in space — which is a real head start for balance, transfers, and any motor recovery you do achieve. People with anterior cord injuries can and do make functional progress, and some reach semi-independent living through intensive rehabilitation.
Incomplete still means some signal gets through. This is not a complete injury. Recovery is more limited here than in the other incomplete patterns, but the general rule still holds — the nervous system can strengthen surviving pathways over months, and the work you put into rehab matters.
What to Fight For
Aggressive, task-specific rehabilitation. Even with a guarded prognosis, the intensity and quality of rehab shape the outcome. Push for challenging, high-repetition, activity-based therapy rather than passive routines. See Physical Therapy & Rehab.
Use the sensation you kept. Make sure your therapists are building on your preserved position sense — it's an asset for balance and motor retraining that not every SCI pattern has.
Don't let bladder, bowel, and blood pressure be afterthoughts. Autonomic effects are common in anterior cord syndrome and have a huge impact on daily life and health. Get them actively managed, not just monitored.
Take pain and spasticity seriously early. Neuropathic pain and spasticity are common and are easier to manage before they're entrenched.
Keep going after inpatient rehab. The most active recovery window is the first several months, but it doesn't stop at the door of the rehab hospital — outpatient and home programs matter.
Living With It
The everyday safety challenge in anterior cord syndrome comes from the loss of pain and temperature on both sides of the body below the injury. You can be burned or injured without feeling it.
The upside of this pattern is that your preserved position sense helps with balance and coordination during transfers and any standing or stepping you work toward — lean on it. And build the bladder, bowel, and skin routines into your day early; in anterior cord syndrome those systems need active management, and good habits prevent the complications that otherwise send people back to the hospital.
Key Takeaways
- Anterior cord syndrome is an incomplete injury to the front two-thirds of the spinal cord, most often from loss of blood supply through the anterior spinal artery — essentially a stroke of the cord.
- Below the injury, on both sides: movement and pain/temperature are lost, while position sense, vibration, and fine touch are preserved.
- Causes are vascular (aortic surgery or disease, low blood pressure, clots) or compressive (burst fracture, disc herniation).
- Diagnosis is by exam plus MRI, which shows the front-of-cord injury and its cause.
- Treatment can't reverse the infarct — it focuses on protecting the cord's blood supply, relieving any compression, and rehabilitation. Routine steroids are not recommended.
- It has the most guarded prognosis of the incomplete syndromes — but preserved position sense is a real rehab asset, and aggressive therapy still matters.
- Because pain and temperature are lost on both sides, burn and pressure-injury prevention are lifelong habits.
Sources & Further Reading
This page draws on published clinical guidance and the lived experience of the SCI community, including:
- Anterior Spinal Artery Syndrome — StatPearls, NCBI Bookshelf (U.S. National Library of Medicine)
- International Standards for Neurological Classification of SCI (ISNCSCI) — American Spinal Injury Association
- Understanding Spinal Cord Injury factsheets — Model Systems Knowledge Translation Center (MSKTC)
- Spinal Cord Injuries — MedlinePlus (U.S. National Library of Medicine)
SCI.help articles are information, not medical advice. Anterior cord syndrome is uncommon and highly individual — practice varies by cause, injury level, provider, and institution. Always confirm specifics with your own care team.