# Cervical Spine Pain and Cervical Radiculopathy

## Introduction

Cervical spine pain is the fourth leading cause of disability worldwide, with a point prevalence of approximately 10-20% in the general population. Cervical radiculopathy — dysfunction of a cervical nerve root resulting in radicular pain, sensory changes, or motor weakness in the corresponding dermatome or myotome — has an annual incidence of approximately 83 per 100,000 persons. Understanding the anatomical basis, natural history, and evidence-based management hierarchy is essential for pain medicine specialists.

## Cervical Spine Anatomy

### Relevant Structural Anatomy

The cervical spine comprises seven vertebrae (C1-C7) that support the head (approximately 4-5 kg) while permitting extensive multiplanar motion. The intervertebral discs are thinner than their lumbar counterparts, and the uncovertebral joints (joints of Luschka), which are unique to the cervical spine, are common sites of osteophyte formation that can cause foraminal stenosis. An important anatomical distinction from the lumbar spine is that cervical nerve roots exit above their corresponding vertebral body — for example, the C6 root exits at the C5-C6 foramen. The facet joints (zygapophyseal joints) are oriented at approximately 45 degrees in the sagittal plane and are innervated by the medial branches of the dorsal rami from two adjacent levels. The vertebral arteries course through the transverse foramina of C1-C6, making them a critical consideration for any cervical interventional procedure. The cervical spinal cord occupies a larger percentage of the spinal canal compared to the lumbar region, which means central pathology carries more serious consequences.

<image>Detailed anatomical illustration of the cervical spine in oblique view showing the neural foramen, exiting nerve root, uncovertebral joint, facet joint, vertebral artery coursing through the transverse foramen, and the relationship of the disc to the nerve root, with all structures clearly labeled</image>

### Common Pain Generators

Facet (zygapophyseal) joints are responsible for an estimated 36-67% of chronic axial neck pain, with referral patterns mapped by Dwyer and Bogduk. Intervertebral discs — most commonly C5-C6 and C6-C7 — can produce cervical discogenic pain. Nerve roots may be compressed by disc herniation (soft compression) or osteophytic foraminal narrowing (hard compression). The atlantoaxial (C1-C2) joint is an often-overlooked source of occipital and suboccipital pain. Myofascial structures — particularly the upper trapezius, levator scapulae, and sternocleidomastoid — contribute through trigger points.

## Natural History of Cervical Radiculopathy

The natural history is generally favorable: approximately 75-90% of patients with cervical radiculopathy improve with conservative management within 8-12 weeks. The landmark study by Saal and colleagues (1996) demonstrated that 92% of patients with cervical radiculopathy from disc herniation had good-to-excellent outcomes with nonoperative care. However, the recurrence rate is approximately 30%, and about 25% may develop chronic pain. Patients with progressive motor deficits, myelopathic signs, or intractable pain despite adequate conservative care warrant surgical evaluation.

## Conservative Management

### Pharmacotherapy

NSAIDs are first-line for acute cervical radiculopathy, used in short courses of 2-4 weeks. A short oral corticosteroid taper (such as a methylprednisolone dose pack) may reduce acute radicular inflammation, though evidence is limited. Neuropathic agents — gabapentin (300-1200 mg three times daily) or pregabalin — are appropriate for persistent radicular pain. Tizanidine at 2-4 mg three times daily addresses associated cervical muscle spasm. Topical lidocaine patches over the cervical paraspinal region can provide additional relief.

### Physical Therapy

Cervical traction, whether mechanical or manual, at 10-15 pounds intermittently may relieve foraminal compression. Cervical stabilization exercises, particularly deep cervical flexor strengthening and scapular stabilization, form the core of the rehabilitation program. Manual therapy including joint mobilization and soft tissue techniques targeting the upper trapezius and levator scapulae is beneficial. Postural correction with ergonomic modifications addressing forward head posture and prolonged screen use is increasingly important. Activity modification involves temporary avoidance of aggravating activities while encouraging early return to function.

## Epidural Steroid Injections

Cervical epidural steroid injections are indicated for radicular pain refractory to 4-6 weeks of conservative management. The interlaminar approach is most commonly performed at C7-T1 to minimize cord risk, using loss-of-resistance technique under fluoroscopy with contrast confirmation; CT guidance may be considered for complex anatomy. The transforaminal approach offers target-specific delivery to the affected nerve root but is controversial due to the risk of vertebral artery injection and particulate steroid embolization — only non-particulate steroids (dexamethasone) should be used via this approach. Evidence is of moderate quality and supports short-term (2-4 week) improvement in radicular pain; efficacy for axial neck pain alone is not established. The FDA has issued a warning regarding rare but serious neurologic events with cervical ESIs, and real-time fluoroscopy with contrast injection is mandatory.

<image>Fluoroscopic anteroposterior and lateral views demonstrating cervical interlaminar epidural steroid injection at C7-T1, with labeled needle position, epidural contrast spread pattern outlining the thecal sac and nerve root sleeves, and anatomical landmarks including spinous processes, laminae, and facet joints</image>

## Cervical Medial Branch Blocks and Radiofrequency Ablation

### Diagnostic Medial Branch Blocks

Medial branch blocks are indicated for axial neck pain suspected to originate from cervical facet joints, typically after failure of conservative care. Under fluoroscopic guidance, the medial branch is targeted at the centroid (waist) of the articular pillar for levels C3-C7; the third occipital nerve is targeted specifically for C2-C3 joint pain. The diagnostic protocol requires dual comparative blocks with two different local anesthetics (such as lidocaine and bupivacaine) to reduce false-positive rates, and concordant relief of at least 80% is required before proceeding to radiofrequency ablation. The cervical facet joint has the strongest evidence base for medial branch diagnostic blocks and RFA in the entire spine, based on the landmark work by Lord and colleagues (1996).

### Radiofrequency Ablation

Conventional RFA involves thermal lesioning at 80 degrees Celsius for 90 seconds, with electrodes placed parallel to the nerve along the articular pillar. Third occipital nerve RFA is technically demanding and requires multiple lesions due to the variable nerve course, with higher recurrence rates than lower cervical levels. In appropriately selected patients, 60-70% achieve at least 50% pain relief lasting 8-14 months. Nerve regeneration occurs over time, but repeat ablation is effective in 70-85% of initial responders.

## Surgical Referral Criteria

Surgical consultation is warranted for progressive motor deficit with worsening myotomal weakness (deltoid, biceps, triceps, grip), myelopathy with upper motor neuron signs (hyperreflexia, Hoffmann sign, Babinski sign, gait ataxia, hand clumsiness), intractable radicular pain after at least 6-12 weeks of comprehensive conservative and interventional management, and radiographic evidence of cervical instability. Surgical options include anterior cervical discectomy and fusion (ACDF), cervical disc arthroplasty, posterior cervical foraminotomy, and laminoplasty for multilevel stenosis.

| Nerve Root | Disc Level | Motor Deficit | Sensory Distribution | Reflex Affected |
|-----------|-----------|---------------|---------------------|----------------|
| C5 | C4-C5 | Deltoid, biceps weakness | Lateral arm (regimental badge area) | Biceps reflex |
| C6 | C5-C6 | Wrist extensors, biceps | Lateral forearm, thumb, index finger | Brachioradialis reflex |
| C7 | C6-C7 | Triceps, wrist flexors, finger extensors | Middle finger | Triceps reflex |
| C8 | C7-T1 | Finger flexors, hand intrinsics | Medial forearm, ring and little fingers | None reliable |
| T1 | T1-T2 | Hand intrinsics (interossei) | Medial arm | None reliable |

<image>Clinical diagram illustrating the dermatomal distribution of cervical nerve roots C4 through T1 on the upper extremity, with corresponding motor deficits and reflex changes for each level, showing C5 (deltoid, biceps reflex), C6 (wrist extension, brachioradialis reflex), C7 (triceps, triceps reflex), and C8-T1 (grip, finger intrinsics)</image>

## Clinical Pearls

Cervical myelopathy must always be assessed in patients presenting with neck pain — it demands urgent surgical evaluation and does not respond to injections. Cervical transforaminal ESIs should only use non-particulate steroids (dexamethasone) because of the risk of catastrophic vascular embolization. Dual diagnostic medial branch blocks are mandatory before cervical RFA; single blocks carry a false-positive rate of approximately 27%. The C2-C3 facet joint, innervated by the third occipital nerve, is the most common source of cervicogenic headache. Imaging findings of cervical spondylosis are extremely prevalent in asymptomatic individuals — disc degeneration is present in more than 50% of patients over age 40 — and must always be correlated with the clinical presentation before being implicated as the pain source.

## References

1. Cohen SP. Epidemiology, diagnosis, and treatment of neck pain. *Mayo Clin Proc*. 2015;90(2):284-299.
2. Lord SM, Barnsley L, Wallis BJ, McDonald GJ, Bogduk N. Percutaneous radio-frequency neurotomy for chronic cervical zygapophyseal-joint pain. *N Engl J Med*. 1996;335(23):1721-1726.
3. Manchikanti L, Nampiaparampil DE, Candido KD, et al. Do cervical epidural injections provide long-term relief in neck and upper extremity pain? A systematic review. *Pain Physician*. 2015;18(1):39-60.
4. Thoomes EJ, Scholten-Peeters GG, de Boer AJ, et al. Lack of uniform diagnostic criteria for cervical radiculopathy in conservative intervention studies: a systematic review. *Eur Spine J*. 2012;21(8):1459-1470.