Spinal Cord Injury (SCI)

Understanding the injury is easier once the anatomy is clear. The spinal cord sits inside the vertebral canal, protected by the ring-shaped back part of each vertebra and cushioned by cerebrospinal fluid. Pairs of nerves branch off it at each level, exiting between the vertebrae to supply the skin and muscles. In most adults the cord itself ends at about the first or second lumbar vertebra (near the bottom of the ribcage), below which the canal contains a bundle of nerve roots called the cauda equina rather than the cord itself. This is why injuries low in the back behave differently from injuries higher up. The cord is organised so that, broadly, signals for the arms leave high in the neck and signals for the legs, bladder and bowel leave lower down — which is the reason the level of an injury predicts so much about its effects.

Most spinal cord injuries are caused by sudden physical trauma. The common mechanisms are road traffic collisions, falls (particularly in older people), sporting and recreational injuries such as diving into shallow water or rugby tackles, and violence. In younger adults, road and sporting injuries predominate; in older adults, falls from standing height are an increasingly important cause, often against a background of pre-existing spinal narrowing or arthritis. The force may fracture or dislocate the vertebrae so that bone or disc presses on the cord, or it may bruise, stretch or tear the cord directly. Not every spinal cord injury involves a broken bone: in some patients, especially older ones, the cord can be injured even when the imaging of the bones looks relatively normal.

One of the most important distinctions doctors make is whether an injury is complete or incomplete. In a complete injury, no movement or sensation is preserved in the lowest sacral segments — the nerves that supply the area around the back passage. In an incomplete injury, some function remains below the level of injury, which may include movement, sensation, or both. This distinction matters because it strongly influences the likely pattern of recovery. To describe injuries precisely and consistently, spinal teams around the world use the ASIA Impairment Scale (part of the International Standards for Neurological Classification of Spinal Cord Injury). It grades injuries from A to E: grade A is a complete injury; grades B, C and D describe increasing amounts of preserved function in an incomplete injury; and grade E means examination findings are normal. Patients often hear this terminology on the ward, and it is simply a standardised shorthand for how much of the cord is still working.

The higher up the spine an injury occurs, the more of the body lies below it, and so the greater the effect. Injuries in the neck (the cervical spine) can affect the arms, the trunk and the legs, and the highest injuries can also affect the muscles used for breathing. Injuries in the chest region (the thoracic spine) typically spare the arms but affect the trunk and legs. Injuries lower down affect the legs, bladder, bowel and sexual function. The terms tetraplegia (also called quadriplegia) and paraplegia describe this pattern: tetraplegia involves the arms as well as the legs and results from injuries in the neck, whereas paraplegia spares the arms.

The symptoms of a spinal cord injury depend on its level and completeness. They can include weakness or complete paralysis of muscles below the injury, numbness or altered sensation, and loss of the normal control of the bladder and bowel. Changes in sexual function are common and are an important part of care even though they are less often discussed. Many people also experience pain — either at the site of the injury or a burning, tingling "neuropathic" pain in areas that are otherwise numb. Some effects appear immediately; others, such as spasticity (stiff, over-active muscles), tend to develop over the following weeks.

In the first hours and days after a severe injury, the cord can enter a temporary state known as spinal shock, in which reflexes disappear and everything below the injury seems switched off. This is a physiological "stunning" of the cord and does not, on its own, indicate the final outcome. As spinal shock resolves over days to weeks, a clearer picture emerges. This is one reason experienced clinicians are careful not to give firm predictions in the earliest phase, and why repeated examination over time is so valuable.

A spinal cord injury is a medical emergency, and certain features require immediate attention: sudden weakness or numbness in the arms or legs after trauma, loss of bladder or bowel control, or a new inability to feel or move part of the body. A particular emergency in the weeks and months after a higher injury is autonomic dysreflexia — a sudden, dangerous rise in blood pressure, often triggered by something as simple as a full bladder, which can cause a pounding headache, sweating and flushing above the injury. It needs urgent treatment. Anyone who has had a spinal cord injury, and those around them, should be taught to recognise it.

Assessment begins at the scene, with careful immobilisation of the spine to prevent further harm, and continues in hospital with a structured neurological examination that maps exactly which movements and sensations are preserved. Imaging is central to diagnosis. A CT scan gives detailed pictures of the bones and is excellent at showing fractures. An MRI scan shows the spinal cord itself, along with discs, ligaments, swelling and any bleeding, and is the best way to see whether the cord is being compressed. The combination of examination and imaging allows the team to determine the level, the completeness and the underlying cause of the injury, which together guide treatment.

The early, non-surgical priorities are sometimes summarised as protecting the cord from further injury. This means keeping the spine still and correctly aligned, ensuring the person is breathing adequately and has enough oxygen, and supporting blood pressure — because the injured cord is highly sensitive to a reduced blood supply. National guidance in the UK (NICE guideline NG41) recommends full in-line immobilisation and rapid transfer of anyone with a suspected spinal cord injury to a major trauma centre, and that trauma networks have clear, agreed plans with their linked spinal cord injury centre. Some specialist centres aim to keep the average blood pressure within a target range for several days after injury, although the ideal target and duration remain areas of active research and the supporting evidence is limited.

Where imaging shows the cord is being compressed — by displaced bone, disc material or a blood clot — surgery to relieve that pressure and to stabilise the spine is often considered. The operation does not repair the cord itself; its aim is to remove the compression and create the most favourable conditions for recovery, while making the spine stable enough to allow rehabilitation. The evidence on timing has strengthened in recent years. Pooled analyses of patient data, and the international STASCIS study, have found that decompression performed early — generally within 24 hours of injury — is associated with better neurological recovery for many patients than later surgery. Reflecting this, the 2024 AO Spine/Praxis clinical practice guidelines recommend surgical decompression within 24 hours as a treatment option in adults with acute spinal cord injury. Even so, whether and exactly when to operate is always an individual decision that depends on the specific injury, the imaging findings, the person's other injuries and their overall condition.

Patients and families sometimes ask about high-dose steroids (methylprednisolone), which were widely used for spinal cord injury in the past. Their role is now genuinely controversial. The original trials suggested a small benefit, but later analysis cast doubt on it, and high-dose steroids carry real risks such as infection and other complications. As a result, they are no longer recommended as a routine standard of care in many centres, and where they are used it is a carefully considered, case-by-case decision. This is a good example of how medical evidence evolves, and of why current guidance can differ from older practice.

Once the immediate injury has been managed, rehabilitation becomes the heart of recovery. It is delivered by a specialist team that may include physiotherapists, occupational therapists, specialist nurses, psychologists, and doctors in rehabilitation medicine. The goals are to build strength and function where recovery is possible, to help people relearn daily tasks and adapt where it is not, to manage bladder, bowel, skin and pain, and to support the emotional adjustment that a major injury brings. Rehabilitation is not a short phase but a process that continues for months and often years, and specialist spinal cord injury centres are designed specifically to provide it.

Because the spinal cord influences so many body systems, a spinal cord injury can lead to a range of complications that the care team works to prevent and treat. These include pressure sores from reduced movement and sensation, urinary infections and other bladder problems, blood clots in the legs or lungs, breathing complications after higher injuries, spasticity, chronic pain, and autonomic dysreflexia after higher injuries. Bone density can reduce over time below the level of injury. Good long-term care, much of which people learn to manage themselves, greatly reduces the risk of these problems.

Recovery after spinal cord injury is genuinely variable, and honest information matters more than false reassurance or undue pessimism. The most important factors are the completeness of the injury (incomplete injuries generally have more potential for recovery than complete ones), the level of injury, the person's age and general health, and the quality and timing of care. Some people regain substantial function; others adapt to lasting changes. Where recovery occurs, it is usually fastest in the first few months and can then continue more gradually over a year or more. It is also worth stating clearly that a spinal cord injury, serious as it is, does not prevent a full and meaningful life: with modern specialist rehabilitation, assistive technology and support, many people with SCI live active, independent and fulfilling lives.

Spinal cord injury is an area of intense research. Scientists are studying ways to protect the cord in the first hours after injury, to reduce the secondary damage that follows the initial trauma, and to encourage nerve repair and regeneration. Approaches under investigation include new drugs, cell-based therapies, electrical stimulation of the cord to restore movement, and rehabilitation technologies such as robotic assistance. Much of this work is still experimental, and it is important to be cautious about claims of cures. But the direction of travel is encouraging, and understanding of the injury is advancing steadily.

Myth: "A spinal cord injury always means paralysis from the neck down." Fact: The effects depend on the level and completeness of the injury; many people retain significant function, particularly with incomplete injuries.

Myth: "If there's no movement immediately, nothing will ever come back." Fact: Early spinal shock can mask function; some recovery may appear over the following weeks and months.

Myth: "Surgery repairs the damaged cord." Fact: Surgery relieves compression and stabilises the spine; it does not physically repair the cord.

Myth: "A wheelchair means a life without independence." Fact: With modern rehabilitation and technology, many people with SCI live active, independent lives.

This page is for general education and does not replace an individual assessment. Treatment depends on a person's specific symptoms, examination findings, imaging findings and overall health, and should always be discussed with a suitably qualified healthcare professional.

The spinal cord is the body's central communication cable — a slender column of nerve tissue, about the width of a finger, that runs from the base of the brain down through a bony canal in the spine. Every message that tells a muscle to move, and every sensation of touch, temperature or pain, travels along it. It also carries out functions we rarely think about, such as helping to control the bladder, the bowel and blood pressure. A spinal cord injury (SCI) means this cable has been damaged, so that some or all of these messages can no longer pass freely between the brain and the parts of the body below the level of the injury. This is one of the most serious injuries in medicine, but it is also widely misunderstood. The purpose of this page is to explain, in plain language, what a spinal cord injury is, why it produces the effects it does, how it is assessed, and what the current evidence says about treatment and recovery.

• —Fehlings MG, Vaccaro A, Wilson JR, et al. Early versus delayed decompression for traumatic cervical spinal cord injury: results of the Surgical Timing in Acute Spinal Cord Injury Study (STASCIS). PLoS One. 2012;7(2):e32037. doi:10.1371/journal.pone.0032037
• —Badhiwala JH, Wilson JR, Witiw CD, et al. The influence of timing of surgical decompression for acute spinal cord injury: a pooled analysis of individual patient data. Lancet Neurol. 2021;20(2):117-126. doi:10.1016/S1474-4422(20)30406-3
• —Fehlings MG, Tetreault LA, Wilson JR, et al. A Clinical Practice Guideline for the Management of Acute Spinal Cord Injury: Introduction, Rationale, and Scope. Global Spine J. 2017;7(3 Suppl):84S-94S. doi:10.1177/2192568217703387
• —Kwon BK, Tetreault LA, Evaniew N, Skelly AC, Fehlings MG. AO Spine/Praxis Clinical Practice Guidelines for the Management of Acute Spinal Cord Injury: An Introduction to a Focus Issue. Global Spine J. 2024;14(3_suppl):5S-8S. doi:10.1177/21925682231189928
• —Fehlings MG, Tetreault LA, Hachem L, et al. An Update of a Clinical Practice Guideline for the Management of Patients With Acute Spinal Cord Injury: Recommendations on the Role and Timing of Decompressive Surgery. Global Spine J. 2024;14(3_suppl):174S-186S. doi:10.1177/21925682231181883 (PMID: 38526922)
• —Roberts TT, Leonard GR, Cepela DJ. Classifications In Brief: American Spinal Injury Association (ASIA) Impairment Scale. Clin Orthop Relat Res. 2017;475(5):1499-1504. doi:10.1007/s11999-016-5133-4
• —Rupp R, Biering-Sørensen F, Burns SP, et al. International Standards for Neurological Classification of Spinal Cord Injury: Revised 2019. Top Spinal Cord Inj Rehabil. 2021;27(2):1-22. doi:10.46292/sci2702-1
• —GBD 2019 Spinal Cord Injuries Collaborators. Global, regional, and national burden of spinal cord injury, 1990-2019: a systematic analysis for the Global Burden of Disease Study 2019. Lancet Neurol. 2023;22(11):1026-1047. doi:10.1016/S1474-4422(23)00287-9
• —Ding W, Hu S, Wang P, et al. Global incidence and characteristics of spinal cord injury since 2000-2021: a systematic review and meta-analysis. BMC Med. 2024;22:285. doi:10.1186/s12916-024-03514-9
• —National Institute for Health and Care Excellence (NICE). Spinal injury: assessment and initial management. NICE guideline NG41. 2016.
• —Bracken MB. Steroids for acute spinal cord injury. Cochrane Database Syst Rev. 2012;(1):CD001046. doi:10.1002/14651858.CD001046.pub2
• —Evaniew N, Belley-Côté EP, Fallah N, et al. Methylprednisolone for the Treatment of Patients with Acute Spinal Cord Injuries: A Systematic Review and Meta-Analysis. J Neurotrauma. 2016;33(5):468-481. doi:10.1089/neu.2015.4192
• —Wilson JR, Cadotte DW, Fehlings MG. Clinical predictors of neurological outcome, functional status, and survival after traumatic spinal cord injury: a systematic review. J Neurosurg Spine. 2012;17(1 Suppl):11-26. doi:10.3171/2012.4.AOSPINE1245
• —Ahuja CS, Wilson JR, Nori S, et al. Traumatic spinal cord injury. Nat Rev Dis Primers. 2017;3:17018. doi:10.1038/nrdp.2017.18
• —Karsy M, Hawryluk G. Modern Medical Management of Spinal Cord Injury. Curr Neurol Neurosci Rep. 2019;19(9):65. doi:10.1007/s11910-019-0984-1
• —Furlan JC, Noonan V, Cadotte DW, Fehlings MG. Timing of decompressive surgery of spinal cord after traumatic spinal cord injury: an evidence-based examination of pre-clinical and clinical studies. J Neurotrauma. 2011;28(8):1371-1399. doi:10.1089/neu.2009.1147
• —Guideline note: NICE NG41 reviewed. No dedicated AAOS clinical practice guideline specific to acute traumatic spinal cord injury was identified at the time of writing; the AO Spine/Praxis 2024 guidelines were used as the principal surgical guideline source.

This information is for general patient education and is not a substitute for an individual consultation. Always seek personalised advice from a qualified spinal specialist.