Cervical disc disease: when a disc affects a nerve root or the spinal cord

Three terms that should not be confused

• Cervical disc degeneration or ‘discopathy’ describes structural change in one or more discs in the neck. It can be an incidental imaging finding, a contributor to mechanical neck pain, or part of narrowing around a nerve root or the spinal cord.
• Cervical radiculopathy means dysfunction of a cervical nerve root, usually because it is compressed or inflamed. It can produce radiating pain, tingling, numbness, focal weakness or reflex change, usually in part of one arm, although patterns vary and do not always follow a perfect textbook map.
• Degenerative cervical myelopathy means that the cervical spinal cord is not functioning normally in association with degenerative compression. It is a clinical syndrome, not an MRI label alone.

Symptoms you may notice and signs a clinician looks for

A symptom is something you experience; a sign is a finding on examination. Neither a single symptom nor a single reflex proves the diagnosis. Early myelopathy can be subtle, and a normal result in one part of the examination does not reliably exclude it.

• Possible nerve-root symptoms: pain from the neck or shoulder into an arm, pins and needles, numbness, or focal weakness. Examination may find a matching loss of strength, sensation or reflex.
• Possible spinal-cord symptoms: loss of finger dexterity, difficulty with buttons or handwriting, dropping objects, numb or awkward hands, imbalance, frequent trips or falls, and stiff, heavy or weak legs. More than one limb may be involved.
• Possible spinal-cord signs: an abnormal gait, brisk reflexes, clonus, an extensor plantar response, impaired hand coordination or other upper-motor-neuron findings. A Hoffmann sign by itself neither confirms nor excludes myelopathy.
• Bladder or bowel dysfunction is usually a late and serious feature. It should not be awaited before seeking assessment for earlier changes in hand or walking function.

What the assessment brings together

• History: where symptoms are felt, which activities have changed, whether one or several limbs are involved, and whether function is stable or deteriorating.
• Neurological examination: gait and balance, hand dexterity, strength, sensation, reflexes and signs of spinal-cord or nerve-root dysfunction.
• Imaging: MRI shows the discs, canal, spinal cord and nerve-root exits. X-rays or CT answer selected questions about bone, alignment or surgical planning.
• Clinical agreement: the level and side seen on imaging must make sense with the symptoms and examination. Degeneration and even radiological cord compression can exist without clinical myelopathy.
• Alternative explanations: shoulder disease, peripheral-nerve entrapment, neuropathy and several neurological conditions can mimic or coexist with a cervical problem.

Treatment when there is neck pain or a nerve-root problem

When examination does not suggest spinal-cord dysfunction or another red flag, uncomplicated neck pain is usually managed without surgery. Education, continued activity and individually selected exercise-based care are common elements. Medication choices and contraindications should be discussed with a clinician.

Many cervical radiculopathies improve with time and non-operative care. Persistent disabling symptoms, progressive objective weakness or a clinical picture that does not fit the scan changes the pathway. Surgery may be discussed when a specific nerve-root syndrome and matching compression remain important despite appropriate care; an abnormal disc image alone is not an indication.

Treatment when degenerative cervical myelopathy is confirmed

Specialist decisions are based on neurological function and its trajectory, examination, the number and location of compressed levels, MRI features, alignment, general health and the person’s priorities. The principal aim of decompression is to prevent or limit further spinal-cord injury; improvement is possible, but established neurological loss may not fully recover.

AO Spine/CSRS guidance recommends surgery for moderate or severe degenerative cervical myelopathy. For clinically mild DCM, it suggests offering either surgery or a supervised trial of structured rehabilitation. If non-operative care is chosen, close clinical follow-up is needed; surgery is recommended if neurological function deteriorates and should be considered if the person does not improve. Cord compression on MRI without clinical myelopathy does not automatically require preventive surgery. When clinical radiculopathy is also present, the risk of developing myelopathy is higher, and specialist discussion of surgery versus close follow-up or structured rehabilitation is appropriate.

Questions worth taking to an appointment

• Do my symptoms and examination suggest a disc finding, a nerve-root problem, spinal-cord dysfunction, or another cause?
• Which findings show that my function is stable or deteriorating?
• Does the MRI abnormality match the level and side of my symptoms?
• What are the reasonable non-operative and operative options in my situation, and what is each intended to achieve?
• Which changes should make me seek urgent or emergency assessment?