Cervical spondylotic myelopathy

01OverviewDefinition, clinical context and the essential points that orientate the chapter.

Age-related cervical change narrows the canal and can buckle ligament or translate vertebrae during flexion and extension. Repeated mechanical stress, ischaemia and inflammation injure the cord. The natural history varies: some people remain stable, others deteriorate stepwise or steadily, and minor trauma can expose limited reserve. Therefore symptom trajectory and objective function, not pain intensity, determine urgency.

The mixed examination is a recurring source of error. Compression at C5 or C6 may damage the exiting segmental anterior horn or root, producing weak or wasted arms and reduced biceps or supinator reflexes. Long tracts travelling to the legs are compressed at the same time, causing brisk knees, clonus and extensor plantar responses. This combination can resemble motor neurone disease, peripheral neuropathy or carpal tunnel syndrome unless sensory, gait, sphincter and imaging evidence is integrated.

MRI confirms anatomical compression, cord signal, levels and surgical planning needs. CT better defines ossification and bone; flexion-extension radiographs are selected by the spinal team for instability. Mild stable disease may be observed through a specialist plan with education and close review, but moderate, severe or progressive disease generally prompts decompression discussion. Physiotherapy addresses function after stability is defined and must not substitute for timely surgical assessment.

Key points

Degenerative cervical myelopathy results from static and dynamic cord compression by discs, osteophytes, ligament thickening, facet change or ossification within a developmentally narrow canal.
Early symptoms are often loss of hand dexterity, dropping objects, difficulty with buttons or handwriting, bilateral paraesthesia and an unsteady or stiff-legged gait rather than severe neck pain.
Examination may show hyperreflexia below the lesion, Hoffmann sign, inverted supinator response, ankle clonus, extensor plantars, impaired tandem gait and proprioceptive loss.
A cervical radiculopathy can coexist and produce focal lower-motor-neurone weakness or reduced arm reflexes at the compressed level while the legs remain brisk.
Bladder urgency or retention and severe imbalance are later or high-risk features; their absence does not exclude clinically important early myelopathy.
MRI cervical spine is the principal investigation, but degenerative cord indentation is common in asymptomatic adults and becomes myelopathy only when clinical cord dysfunction correlates.
Cord T2 signal change supports injury and may affect prognosis, yet its absence does not make progressive clinical myelopathy safe to observe without specialist review.
NICE referral guidance treats gait disturbance, clumsy or weak hands or legs, brisk reflexes, extensor plantars and new sphincter change as reasons not to manage a presumed radiculopathy routinely.
Surgical decompression aims mainly to stop further neurological decline; improvement may occur but established disability, especially after long delay, can persist.
Avoid high-velocity cervical manipulation in suspected myelopathy and provide individual falls, driving, work and activity advice while definitive assessment proceeds.

02AetiologyUnderlying causes, associations and risk factors, with why each one matters.

Degenerative canal narrowing

Disc height loss, osteophytes, facet change and ligament thickening progressively reduce cervical canal space, particularly where several levels are affected.

Developmentally narrow canal

A congenitally small canal leaves less reserve for ordinary age-related change, allowing relatively modest degeneration to deform the cord.

Dynamic and ossifying disease

Repeated flexion–extension shear, segmental instability or ossification of supporting ligaments can add intermittent injury beyond the static compression visible on neutral imaging.

03PathophysiologyThe causal sequence from the underlying abnormality to symptoms and harm.

1
Static cord compression
Degenerative tissue indents the cervical cord and flattens neural tracts within a canal that cannot expand.
2
Dynamic strain and vascular compromise
Neck movement repeatedly stretches the tethered cord and compresses small vessels, producing focal ischaemia and blood–cord barrier injury.
3
Demyelination and axonal loss
Chronic mechanical and vascular injury damages myelin and axons, sometimes creating intramedullary signal change and irreversible tissue loss.
4
Long-tract and segmental failure
Corticospinal and dorsal-column dysfunction causes spastic legs and proprioceptive gait disturbance, while root or anterior-horn injury adds focal arm weakness and reduced reflexes.

04Clinical features and red flagsSymptoms, examination findings, patterns of presentation and time-critical warnings.

Hand dexterity declineRed flag

Buttons, coins, keys, handwriting, cutlery and phone use become slow or unreliable, objects are dropped and both hands may feel numb or stiff despite little neck pain.

Long-tract gaitRed flag

The legs feel heavy or stiff, balance worsens, tandem walking fails and falls occur, with brisk knees, clonus or extensor plantar responses below the cervical lesion.

Mixed root and cord signsRed flag

Segmental arm weakness, wasting or a reduced reflex coexists with hyperreflexic legs and gait disturbance, indicating cervical cord compression plus radiculopathy rather than an isolated root lesion.

Posterior-column involvement

Loss of vibration or joint position, sensory ataxia and a positive Romberg sign occur when dorsal pathways are affected; Lhermitte electric sensations may be provoked by neck flexion.

Advanced autonomic diseaseRed flag

Urinary urgency, hesitancy or retention, bowel dysfunction and major transfer difficulty indicate substantial cord involvement after urological and medication causes are considered.

05InvestigationsWhat to request, why it matters and how to interpret it.

Investigation order

Read from the initial assessment onwards. Tests may run in parallel in urgent care; first-line, preferred, confirmatory, definitive and gold-standard labels appear only when the chapter explicitly states them.

01
MRI cervical spineFirst step
Why
Demonstrate cord compression, level, canal reserve, intramedullary signal and alternative tumour, infection or inflammatory disease.
Interpretation and limitations
Correlate each compressed level with hand, limb and long-tract findings. Degenerative narrowing alone is not clinical myelopathy, while progression can be important without T2 hyperintensity.
02
Structured upper and lower limb examination
Why
Prove cord dysfunction, map segmental root involvement and establish a reproducible pre-treatment baseline.
Interpretation and limitations
Test hand dexterity, myotomes, wasting, tone, all limb reflexes, Hoffmann and plantar responses, proprioception, tandem gait and Romberg; one isolated Hoffmann sign is nonspecific.
03
CT cervical spine
Why
Define osteophyte, facet anatomy, ossification of the posterior longitudinal ligament and operative bony detail.
Interpretation and limitations
CT complements MRI but cannot assess intrinsic cord injury as well. Dynamic or myelographic studies are specialist choices when standard MRI is unsuitable or instability is suspected.
04
Electrophysiology
Why
Clarify coexisting entrapment neuropathy, root disease, motor neurone disease or peripheral neuropathy when the clinical picture is mixed.
Interpretation and limitations
Nerve-conduction and EMG findings do not exclude cord disease and should not delay spinal referral when gait and long-tract signs are established.
05
Functional and autonomic assessment
Why
Quantify disability, falls and sphincter involvement that influence urgency and outcome goals.
Interpretation and limitations
Record walking distance, timed gait, hand tasks, falls, work, driving and post-void residual when relevant; interpret urinary symptoms with the neurological pattern.
06
Cause-directed laboratory tests
Why
Exclude B12 or copper deficiency, inflammation, infection and other mimics when imaging does not fully explain the syndrome.
Interpretation and limitations
Use targeted testing rather than allowing mild degenerative findings to end the diagnostic process in a discordant or rapidly progressive presentation.

06Differential diagnosisRealistic alternatives and the features that help distinguish them.

Cervical radiculopathy

Dermatomal pain, myotomal weakness and a reduced segmental reflex without gait, pyramidal or sphincter signs favour isolated root disease, although both conditions may coexist.

Peripheral neuropathy or entrapment

Length-dependent sensory loss, distal areflexia or a single named-nerve pattern supports peripheral disease; brisk legs and a Hoffmann or plantar response point back to cord involvement.

Motor neurone disease

Progressive upper and lower motor-neurone signs without sensory loss can mimic myelopathy, but concordant cord imaging and dorsal-column symptoms support compression.

Inflammatory or structural myelopathy

Rapid progression, a long intramedullary lesion, systemic inflammation, tumour or infection features should widen assessment beyond ordinary degenerative disease.

Additional chapter-specific clues

Alternative diagnosis

Abrupt onset, fever, weight loss, cranial signs, a clear peripheral length-dependent pattern or no anatomical MRI correlate should prompt vascular, infective, inflammatory, neoplastic or peripheral investigation.

07ManagementImmediate care, first-line treatment, alternatives and escalation.

01Suspected myelopathyEscalate the cord signsFirst stepEscalationHand clumsiness, gait change or bilateral symptoms accompany brisk reflexes, plantars or mixed arm and leg signs.

1Document dexterity, segmental strength, all limb reflexes, plantar responses, sensory modalities, gait and bladder or bowel symptoms and ask how quickly function is changing.
2Arrange urgent cervical MRI and specialist spinal referral; use emergency pathways for rapid decline, trauma, loss of walking or new sphincter dysfunction.
3Avoid cervical manipulation and unsafe high-impact activity, assess falls and driving and give explicit return instructions while the patient awaits review.

02Imaging correlationSeparate compression from incidental ageingMRI shows degenerative canal narrowing or cord indentation.

1Review whether the compressed level and laterality explain the examination, whether there is cord signal change and whether another lesion or peripheral disorder coexists.
2Grade functional severity and progression through hand tasks, gait, falls and autonomic symptoms rather than the radiology phrase alone.
3EscalationDiscuss moderate, severe or progressive disease with a cervical spine surgeon; use specialist surveillance only for a genuinely mild stable phenotype with clear escalation criteria.

03After treatment decisionProtect recovery and detect recurrenceDecompression or a supervised conservative plan has been agreed.

1For surgery, explain that the primary aim is halting decline, optimise smoking, nutrition, diabetes and bone health and clarify approach-specific swallowing, voice or adjacent-level risks.
2Begin postoperative or stability-approved rehabilitation for hand use, balance, strength, equipment and return to activity without forcing a compromised cord through aggressive manipulation.
3EscalationRepeat objective function and image when indicated, escalating new hand loss, gait decline, sphincter symptoms, wound problems or a new radicular deficit.

Key medicines and prescribing safety4 treatments · regimens, roles and cautions

Clarifies that analgesia and rehabilitation address symptoms but cannot remove mechanical neural compromise.

No disease-reversing tablet

There is no oral dose that decompresses the cervical cord or substitutes for surgical assessment.

Repeated medicine escalation can delay recognition, worsen falls or retention and create false reassurance while dexterity and gait decline.

May reduce coexisting neck or radicular pain while definitive cord management is planned.

Simple and anti-inflammatory analgesia

Use the lowest effective formulary dose for the shortest appropriate period after individual risk assessment.

NSAIDs carry gastrointestinal, renal and cardiovascular risks; analgesic success does not demonstrate neurological stability or justify delaying referral.

Can reduce burning or shooting radicular pain that limits sleep and participation.

Neuropathic-pain option

Select and titrate one NICE-supported agent only for a clear neuropathic pain component and measurable goal.

Sedation, falls, cognition, anticholinergic effects, renal dosing and dependence differ by drug; these medicines do not treat myelopathy itself.

Removes mechanical compression and aims to arrest neurological progression in appropriate symptomatic disease.

Surgical decompression

The spinal team selects anterior, posterior or combined decompression and stabilisation by levels and alignment.

Consent covers neurological injury, infection, non-union, dysphagia or dysphonia, adjacent disease and incomplete recovery; exact risks depend on approach.

08ComplicationsImportant consequences, why they occur and why they matter clinically.

Irreversible hand and gait disability

Continuing axonal loss causes loss of dexterity, falls and dependence; decompression may halt decline but cannot reliably reverse established cord damage.

Falls and traumatic cord injury

Poor balance and a narrowed canal increase the consequences of minor trauma, potentially causing abrupt central cord deterioration.

Bladder and bowel dysfunction

Advanced long-tract disease can impair urgency, emptying and continence, adding infection, skin, independence and personal-care problems.

Pain, spasticity and deconditioning

Neuropathic pain and increased tone restrict sleep and mobility, while fear and inactivity accelerate weakness and functional decline.

09Monitoring and follow-upTreatment response, safety checks and longer-term review.

Repeat a consistent hand task, myotomal power, reflex pattern, tandem gait and falls history so progression is visible before gross weakness develops.
Ask about urinary initiation, urgency, retention, bowel change and sexual function, investigating competing causes while treating new neurological change urgently.
Review analgesic sedation, gait safety, driving, work hazards and home adaptations while specialist assessment is pending.
After surgery, monitor wound, swallowing, voice, new weakness, alignment restrictions and venous-thromboembolism risk through the local pathway.
Track rehabilitation goals and residual disability honestly; radiological decompression does not guarantee reversal of chronic cord injury.
Escalate any rapid hand or leg decline, new loss of walking, trauma, sphincter dysfunction or breathing change as an emergency.

10Special situationsVariants, exceptions and circumstances that change the usual approach.

Hands reveal the cord

Loss of buttoning, handwriting and rapid grip-release may precede obvious leg weakness and should not be attributed automatically to ageing or arthritis.

Arms may look lower motor

Root or anterior-horn injury at the compressed segment can reduce arm reflexes while corticospinal compression makes the legs brisk.

Pain may be minor

A patient can have advanced gait and dexterity loss with little neck pain, so pain severity is a poor measure of cord risk.

MRI ageing is common

A narrowed canal without clinical dysfunction is not synonymous with myelopathy; management follows correlation, severity and progression.

Signal is prognostic

Cord T2 hyperintensity supports established tissue injury, but absence of signal change does not negate a convincing progressive syndrome.

Surgery prevents more

Patients should understand that decompression often stops deterioration and may improve function, but long-standing deficits can remain.

11Common pitfallsFrequent interpretation and management errors.

01
Calling bilateral hand numbness carpal tunnel syndrome without examining gait, legs, reflexes and plantar responses.
02
Treating a reduced arm reflex as proof against myelopathy despite brisk legs and impaired tandem gait.
03
Reassuring from the absence of neck pain, bladder symptoms or cord T2 signal.
04
Diagnosing symptomatic myelopathy from incidental MRI compression without clinical cord dysfunction.
05
Sending progressive disease for routine physiotherapy or cervical manipulation before spinal review.
06
Promising that decompression will reverse every established deficit rather than primarily halt decline.