Degenerative Cervical Myelopathy

A condition guide by Mr Mohammed Madi, Consultant Orthopaedic & Spinal Surgeon.

Degenerative cervical myelopathy is the most common cause of spinal cord problems in adults, yet it is also one of the most frequently missed. The symptoms can be subtle and easy to attribute to ageing — clumsy hands, a slightly unsteady walk, a stiff neck — which is precisely why it is so often recognised late. This page explains what the condition is, how it is diagnosed, and how it is treated, written for patients and families as well as for general practitioners, physiotherapists, students and colleagues who want a fuller account.

Degenerative cervical myelopathy — usually shortened to DCM — is a slow, progressive injury to the spinal cord in the neck, caused by age-related wear of the surrounding spine gradually narrowing the space the cord sits in. As that space tightens, the cord is compressed, and over time it begins to work less well.

The word myelopathy simply means a problem with the spinal cord itself, as opposed to radiculopathy, which is a problem with an individual nerve root branching off it. The two can occur together, but they are not the same thing, and the distinction matters for both diagnosis and treatment.

DCM is best thought of as an umbrella term. It includes cervical spondylotic myelopathy (the form driven by general wear, or spondylosis), as well as cord compression from ossification of the posterior longitudinal ligament, thickening of the ligamentum flavum, and bulging or collapsed discs. In 2022, an international group of surgeons, physicians and patients (the AO Spine RECODE-DCM initiative) agreed on "degenerative cervical myelopathy" as the single preferred term, to replace a confusing patchwork of older labels. You may still see the older term "cervical spondylotic myelopathy" used interchangeably.

In plain terms: the bones, discs and ligaments of an ageing neck slowly encroach on the tunnel that protects the spinal cord. When that encroachment starts to press on the cord and interfere with its function, the result is degenerative cervical myelopathy.

The neck contains seven cervical vertebrae stacked in a gentle forward curve. Running through the middle of this column is the spinal canal, and within it the spinal cord — the thick cable of nerve tissue that carries signals between the brain and the rest of the body. Between each pair of vertebrae sits an intervertebral disc, which acts as a cushion, and a pair of small facet joints that guide movement.

Inside the cord, signals travel in organised tracts. The descending corticospinal tract carries movement instructions from the brain to the limbs; the ascending dorsal columns carry the sense of position, vibration and fine touch; and the spinothalamic tracts carry pain and temperature. Because the corticospinal and spinothalamic tracts run towards the outside of the cord, they tend to be affected first when the cord is squeezed — which helps explain the early pattern of clumsy hands, stiffness and unsteadiness.

A useful quirk of anatomy is that the nerve fibres serving the legs sit towards the outer edge of the cord. This is one reason why a problem in the neck can produce prominent symptoms in the legs and walking, sometimes more than in the arms.

The spine ages in everyone. Discs lose height and bulge, the vertebrae form bony spurs (osteophytes), the ligaments thicken, and the joints enlarge. In most people this causes nothing worse than some stiffness. In a minority, these changes accumulate to the point where they narrow the spinal canal enough to press on the cord.

Two kinds of force are at work. Static compression is the fixed narrowing from bone, disc and ligament. Dynamic compression is the additional squeeze that happens with movement: bending the neck back can cause the ligamentum flavum to buckle inwards, while bending it forward can stretch the cord over bony ridges at the front. A canal that is already narrow tolerates these movements poorly. People born with a constitutionally narrow canal are therefore more vulnerable, because they have less spare room to begin with.

The injury to the cord is not purely mechanical. Sustained pressure reduces blood flow, disturbs the small vessels, and sets off a cascade of inflammation, loss of the protective myelin coating, and death of nerve cells. This is why the damage can become established and only partly reversible — and why halting the process matters.

The fundamental cause is age-related degeneration of the cervical spine, so the single biggest risk factor is simply getting older. Most people present in their late fifties to mid-sixties, and the great majority of people over seventy have some degree of cervical spondylosis on imaging, though only a fraction develop myelopathy.

Other contributors include a congenitally narrow spinal canal, ossification of the posterior longitudinal ligament (more common in East Asian populations), a physically demanding history that accelerates wear, and the presence of degeneration across several levels at once. The condition is roughly three times more common in men than women. Smoking does not cause DCM but is consistently associated with poorer recovery, and is worth addressing in anyone facing surgery.

DCM usually develops gradually, and its early symptoms are easy to dismiss. The most characteristic are:

Loss of hand dexterity — difficulty with buttons, zips, coins, jewellery clasps or handwriting; a sense that the hands have become clumsy or unreliable.

Numbness, tingling or altered sensation in the hands and arms, and sometimes in the legs.

Unsteadiness and balance problems — a feeling of walking on uneven ground, a wider gait, more frequent trips or falls.

Neck pain and stiffness, present in around half of people, though notably many have little or no neck pain.

Lhermitte's phenomenon — a brief electric-shock sensation passing down the spine or into the limbs when the neck is bent forward.

Heaviness, weakness or stiffness in the legs as the condition advances.

Bladder or bowel disturbance — typically a later feature, and one that should always prompt urgent assessment.

A defining feature is that these symptoms are persistent rather than fluctuating: they do not come and go from hour to hour in the way that, say, a trapped nerve sometimes does. Progression is variable and hard to predict — some people remain stable for years, while others deteriorate more steadily.

Certain features suggest the cord is under significant or rapidly increasing pressure and warrant prompt or urgent specialist review:

A rapid worsening of hand function, walking or balance over days to weeks.

New or progressive weakness in the arms or legs.

New disturbance of bladder or bowel control.

Frequent falls or an inability to walk safely.

These do not mean an emergency operation is inevitable, but they do mean the situation should be assessed without delay.

DCM is, in the first instance, a clinical diagnosis supported by imaging — not the other way around. The hallmark on examination is the presence of upper motor neuron signs below the level of compression, reflecting injury to the cord rather than to an isolated nerve.

These signs include exaggerated reflexes (hyperreflexia), a positive Hoffmann's sign (a reflex flick of the thumb and fingers), a positive Babinski response, clonus (rhythmic beats at the ankle), an inverted supinator reflex, increased muscle tone (spasticity) and a wide-based, unsteady gait. At the level of the compression there may instead be lower motor neuron features such as wasting of the small muscles of the hand.

No single sign is decisive. Hoffmann's sign, for example, is reasonably specific but is also found in some healthy people; sustained clonus and a Babinski response are highly specific but present in only a minority. The diagnosis rests on the overall pattern — the combination of a suggestive history, several corroborating signs, and imaging that matches. A careful examination also helps separate DCM from conditions that can imitate it.

Magnetic resonance imaging of the cervical spine is the investigation of choice. It shows the discs, ligaments and — crucially — the spinal cord itself, demonstrating where and how severely the cord is compressed. A bright signal within the cord on T2-weighted images (signal change) indicates cord injury and is associated with more established disease; a corresponding dark area on T1-weighted images tends to suggest a poorer outlook. MRI also helps exclude other causes of cord problems.

An important caveat is that cord compression on a scan is common in older people who have no symptoms at all. Imaging findings must therefore always be interpreted alongside the clinical picture; a scan showing compression does not, on its own, make the diagnosis.

CT is superior for showing bone detail and is particularly useful where ossification of the posterior longitudinal ligament is suspected, or when MRI is not possible.

CT myelography is a valuable alternative when MRI is contraindicated, for example in some patients with pacemakers or metal implants.

Plain X-rays, including flexion and extension views, help assess alignment, the overall curve of the neck, and any instability.

Where the picture is atypical, nerve conduction studies and electromyography can help distinguish DCM from peripheral nerve problems such as carpal or cubital tunnel syndrome, and blood tests or further imaging can address other possibilities. Conditions that can resemble DCM include multiple sclerosis, motor neurone disease, vitamin B12 or copper deficiency, and peripheral neuropathy — which is why a broad clinical assessment matters.

Severity is most commonly graded using the modified Japanese Orthopaedic Association (mJOA) score, which assesses upper limb and lower limb function, sensation and bladder control:

Mild: mJOA 15–17.

Moderate: mJOA 12–14.

Severe: mJOA 11 or below.

The older Nurick grade focuses on walking ability and is still sometimes used. These scales matter because severity, more than any single scan finding, guides whether and when to recommend surgery, and because they allow change over time to be measured objectively.

The course of DCM is genuinely variable, and honest counselling acknowledges this uncertainty. Broadly:

Asymptomatic cord compression found incidentally on a scan, in someone with no symptoms or signs, usually remains stable. Most such individuals never develop myelopathy, and surgery is not recommended simply because compression is present.

Established, symptomatic DCM tends to progress, though at an unpredictable rate. Across the available studies, somewhere between roughly a fifth and three-fifths of people managed without surgery deteriorate over three to six years, and a proportion of these eventually come to surgery.

Mild disease has a more favourable but still uncertain outlook, and a meaningful number of people remain stable.

Because deterioration cannot be reliably predicted in any one person, monitoring is central to non-surgical care, and a clear plan for what would trigger surgery is part of good management.

For people with mild or stable symptoms, a period of careful non-surgical management with monitoring is reasonable. This may include structured physiotherapy, activity modification to avoid high-risk movements and impacts, pain relief where neck pain is a feature, and attention to general health and modifiable risks such as smoking.

Two points deserve emphasis. First, the evidence base for conservative treatment is limited and of modest quality; it is best understood as a way of managing symptoms and observing the condition rather than a cure. Second, certain interventions carry real risk in a cord that is already compressed — vigorous cervical manipulation and traction in particular have been linked to neurological deterioration and are generally avoided. Physiotherapy is most safely delivered by therapists experienced in this specific condition.

Non-surgical care is not a passive choice. It involves agreeing what symptoms to watch for and reviewing regularly, so that any deterioration is caught early.

The aim of surgery is to take the pressure off the spinal cord (decompression), and where necessary to stabilise the spine, in order to halt the progression of the condition and create the conditions for some recovery. The guiding principles, supported by international guidance from AO Spine, are:

Moderate and severe DCM: surgery is recommended. The evidence that decompression improves function in this group is consistent.

Mild DCM: either surgery or a supervised trial of structured rehabilitation is reasonable, decided together with the patient. More recent evidence suggests surgery is also a valid option in mild disease, with generally favourable outcomes — so the decision rests on the balance of symptoms, scan findings, rate of change and personal preference.

Progressive disease: if symptoms worsen on non-surgical management, surgery is recommended.

Incidental, asymptomatic compression: preventive surgery is not recommended.

A consistent theme across the research is that time matters. Outcomes tend to be better in people treated earlier in the course of the disease, before deficits become fixed. This is the central reason for prompt referral when myelopathy is suspected.

The right operation depends on where the compression is (front or back of the cord), how many levels are involved, the alignment of the neck, and individual factors such as age and other health conditions. The main approaches are:

Anterior (front of the neck): anterior cervical discectomy and fusion (ACDF) removes a worn disc and any spurs and fuses that level; anterior cervical corpectomy and fusion (ACCF) removes part of a vertebral body to deal with compression behind it. Anterior approaches are generally favoured for one or two levels and for compression arising from the front.

Posterior (back of the neck): laminectomy with fusion removes the bony arch to give the cord room and stabilises the segment; laminoplasty reshapes and rehinges the bony arch to enlarge the canal while preserving more movement. Posterior approaches are generally favoured for multilevel disease, particularly where the neck retains a good forward curve.

A large randomised trial comparing anterior with posterior surgery for multilevel disease found no meaningful difference in patient-reported physical function at one year, indicating that both approaches are valid and that the choice should be individualised rather than dictated by a single "best" operation.

It is important to set realistic expectations. The primary purpose of surgery is to stop the condition getting worse by relieving pressure on the cord. Many people also experience genuine improvement — in hand function, walking, balance and quality of life — and large prospective studies have shown significant average gains in function, disability and quality-of-life scores that are sustained over at least two years.

However, recovery is partial and variable. Surgery cannot reliably reverse damage that is already well established, and a proportion of people are left with residual symptoms such as some numbness, stiffness or reduced dexterity even when the operation has successfully halted progression. The best results are seen in people who are younger, who have had symptoms for a shorter time, whose disease is milder, who do not smoke, who have fewer other health problems, and who have not yet developed significant walking difficulty. None of this means surgery is not worthwhile in more advanced disease — there, the priority is often to prevent further decline.

Recovery varies with the operation and the individual. Most people stay in hospital for a short period after surgery and return gradually to normal activities over the following weeks. After a fusion, the bone takes time to unite, and there are usually some restrictions on heavy lifting and certain neck movements during healing. Where the nerves and cord have begun to recover, improvement can continue over many months, not just weeks. Physiotherapy and rehabilitation play an important part, and the specifics are tailored to the procedure performed.

Cervical spine surgery for DCM is generally safe in experienced hands, but no operation is without risk, and an honest discussion of these is part of informed consent. Possible complications include:

C5 nerve palsy — temporary weakness of shoulder elevation, which can occur after either approach and usually recovers over weeks to months.

Difficulty swallowing (dysphagia) and hoarseness — associated mainly with anterior surgery and usually temporary.

Failure of the bone to fuse (pseudarthrosis) or hardware-related problems.

Dural tear with leakage of spinal fluid, infection, or bleeding.

Adjacent segment degeneration — accelerated wear at neighbouring levels over the longer term, more relevant after fusion.

Worsening of myelopathy — uncommon, but a recognised risk of any surgery on a compressed cord.

Injury to the recurrent laryngeal nerve or, rarely, the vertebral artery.

The overall risk profile is favourable relative to the natural tendency of moderate and severe untreated disease to deteriorate, which is why surgery is recommended in those groups.

For most people who undergo timely surgery, the gains in function and quality of life are maintained over the long term, and the relentless decline of untreated moderate-to-severe disease is halted. Untreated symptomatic myelopathy, by contrast, can lead to progressive disability and has been associated with reduced quality of life and, in advanced cases, loss of independence. There is also evidence that timely treatment can restore life expectancy that established myelopathy may otherwise reduce. The consistent message is that recognising and treating the condition before severe, fixed deficits develop offers the best long-term outlook.

Research in DCM is active and increasingly well organised, partly through the international AO Spine RECODE-DCM programme, which has agreed standard terminology, a core dataset and shared research priorities. Current and emerging themes include:

Earlier diagnosis. Because delayed recognition worsens outcomes, much effort is directed at helping primary care and other clinicians spot the condition sooner.

Better imaging biomarkers. Advanced MRI techniques such as diffusion-weighted imaging are being studied to predict how much a given cord is likely to recover, and recent guidance cautiously supports their use for prognosis.

Refined prognosis. Validated prediction tools combine age, symptom duration, severity, smoking and walking ability to estimate the likely benefit of surgery for an individual.

Neuroprotection. Drugs intended to protect the injured cord have been trialled; results to date have not established a clear functional benefit, and this remains an area of investigation rather than routine care.

These developments are evolving, and recommendations may change as the evidence matures.

"It's just wear and tear — nothing can be done." Wear and tear is the cause, but DCM is a treatable cord condition, and timely surgery can halt progression and improve function.

"My scan shows compression, so I must need surgery." Compression without symptoms or signs usually does not require surgery; the clinical picture leads.

"No neck pain means it can't be my neck." Many people with DCM have little neck pain; the telling features are in the hands, balance and reflexes.

"Surgery will reverse everything." Surgery chiefly stops deterioration; improvement is common but partial, and is greatest when treatment is early.

"Physiotherapy alone will fix it." Physiotherapy has a role, especially in mild disease, but it cannot decompress the cord in established myelopathy.

Degenerative cervical myelopathy is a slow injury to the spinal cord caused by age-related narrowing of the neck. Its early signs — clumsy hands, subtle unsteadiness, altered sensation — are easily missed, and delay worsens outcomes, so prompt recognition matters. Diagnosis combines a careful examination, looking for upper motor neuron signs, with MRI, interpreted together rather than in isolation. Mild, stable disease can reasonably be monitored with supervised non-surgical care; moderate and severe disease is best treated surgically to halt progression, with the realistic aim of stopping decline and often achieving meaningful, if partial, recovery. The earlier the condition is treated, the better the typical result.

This page is for general education and does not replace advice from your own clinical team. If you notice a rapid change in hand function or walking, new weakness, or any new disturbance of bladder or bowel control, seek prompt medical review.

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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.