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Neck pain - whiplash injury

SNOMED: 39121000087105824 words•Updated 03/03/2026
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Exam Tips

  • In trauma OSCEs, rule out serious injury before testing neck movement; if red flags are present, immobilise and arrange urgent emergency assessment.
  • Use the Quebec WAD grading clearly: I (pain only), II (musculoskeletal signs), III (neurological signs), IV (fracture/dislocation).
  • Quote the Canadian C-spine rule logic: high-risk features need imaging; low-risk + able to rotate 45 degrees each side usually does not.
  • Persistent symptoms are not purely biomechanical; mention psychosocial predictors (fear, PTSD, low recovery expectation) to score highly in viva discussion.
  • For revision diagrams, see a cervical spine trauma mechanism figure and a Canadian C-spine rule flowchart in your MSK/emergency medicine core text.

Definition

Whiplash injury is an acute neck injury caused by rapid acceleration-deceleration forces that produce sudden hyperextension, hyperflexion, rotation, or compression of the cervical spine, most often after road traffic collisions. The term whiplash-associated disorder (WAD) describes the resulting clinical syndrome of neck pain with possible neurological and non-specific symptoms, ranging from mild soft-tissue pain to injury with fracture or dislocation.

Pathophysiology

The core mechanism is rapid transfer of kinetic energy to cervical tissues, typically in rear-end or side-impact collisions. Most patients have no major abnormality on imaging, and symptoms are thought to arise from soft-tissue and joint injury (muscle strain, ligament sprain, facet joint/disc irritation), with secondary muscle spasm and reduced movement. In some patients, peripheral nociceptive input is amplified by central sensitisation, and recovery is strongly modified by psychological factors (for example fear-avoidance, post-traumatic stress symptoms, low recovery expectation), which helps explain persistent pain/disability despite limited structural findings.

Risk Factors

  • Rear-end or side-impact motor vehicle collision
  • Sports trauma, physical assault, or other high-energy neck trauma
  • Dangerous mechanism (for example fall >1 m, diving injury) or significant associated head/facial trauma
  • Age 65 years or older (higher risk of serious cervical injury)
  • Pre-existing rigid spinal disease (for example ankylosing spondylitis) or osteoporosis (higher fracture risk with minor trauma)
  • High initial pain intensity, reduced early neck range of motion, or high early healthcare utilisation (risk of persistent symptoms)
  • Negative recovery expectations, kinesiophobia, pain-related depression, or post-traumatic stress symptoms

Clinical Features

Symptoms

  • Neck pain (may refer to shoulder/arm)
  • Occipital headache (often short duration and low intensity, but can be severe)
  • Neck stiffness and reduced cervical movement
  • Dizziness, fatigue, sleep disturbance, nausea, or paraesthesia
  • Visual disturbance (blurred vision/photophobia), tinnitus, dysphagia, or temporomandibular pain
  • Cognitive complaints (poor concentration, memory difficulty)

Signs

  • Reduced active cervical range of motion
  • Paracervical muscle tenderness/spasm
  • Midline cervical tenderness (red flag for significant injury)
  • Neurological deficit: altered sensation, weakness, or abnormal reflexes (WAD III)
  • Features of cervical myelopathy (hyperreflexia, Babinski sign, clonus, gait disturbance, Hoffmann/Lhermitte signs)
  • Systemic or alternative-cause red flags: fever, weight loss, night pain, rash/purpura, meningism

Investigations

Clinical assessment with Quebec WAD grading:Grades I-II have neck pain with/without musculoskeletal signs and no major neurological deficit; Grade III includes objective neurological signs; Grade IV indicates fracture/dislocation.
Canadian C-spine rule (in suitable adults with trauma):Identifies who needs cervical imaging; if low-risk features are present and the patient can rotate neck 45 degrees left and right, cervical radiography is usually unnecessary.
Cervical spine imaging (X-ray/CT as trauma protocol indicates):Used when high-risk features suggest fracture/dislocation; many uncomplicated whiplash cases show no specific pathological abnormality.
Neurological examination of upper and lower limbs:May show sensory loss, reduced power, or reflex changes in WAD III; upper motor neuron signs suggest myelopathy and urgent specialist assessment.
Screen for serious alternative pathology:If infection/malignancy/meningitis suspected, targeted blood tests and urgent imaging/lumbar puncture pathways are guided by red flags rather than routine whiplash work-up.
Pain and disability scoring (VAS, Neck Disability Index):Provides baseline severity and helps monitor recovery trajectory and need for escalation.

Management

Lifestyle Modifications

  • Reassure and advise early gentle return to usual activities/work; avoid prolonged immobilisation.
  • Encourage active neck range-of-motion exercises and structured physiotherapy if function remains limited.
  • Provide clear safety-netting: urgent review for new neurological deficit, severe/worsening pain, systemic features, or bladder/bowel symptoms.
  • Assess psychosocial factors (fear, low recovery expectation, PTSD/depression symptoms) early and address them proactively.

Pharmacological Treatment

Simple analgesic

  • Paracetamol 1 g orally every 4-6 hours when required (maximum 4 g/24 hours)

First-line for pain; reduce maximum dose in low body weight, frailty, or hepatic impairment; avoid accidental duplication with combination products.

Non-steroidal anti-inflammatory drugs (NSAIDs)

  • Ibuprofen 400 mg orally three times daily with/after food
  • Naproxen 250-500 mg orally twice daily with food

Use lowest effective dose for shortest duration. Avoid/caution in peptic ulcer disease, CKD, heart failure, uncontrolled hypertension, anticoagulant use, and late pregnancy; consider gastroprotection (for example omeprazole 20 mg once daily) if GI risk is increased.

Weak opioid (short-course rescue only if severe pain not controlled)

  • Codeine phosphate 30-60 mg orally every 4-6 hours when required (maximum 240 mg/24 hours)

Short duration only due to dependence, sedation, and constipation risk; avoid with significant respiratory depression; caution driving and concurrent sedatives/alcohol.

Surgical / Interventional

  • No role in uncomplicated WAD I-II.
  • Urgent spinal/orthopaedic or neurosurgical management is required for WAD IV (fracture/dislocation) or unstable neurological compromise.

Complications

  • Persistent neck pain and disability (chronic WAD)
  • Reduced activities of daily living and work limitation with socioeconomic impact
  • Depression or anxiety comorbidity
  • Post-traumatic stress disorder after traumatic collision
  • Medication-related adverse effects (for example NSAID GI/renal toxicity, opioid dependence or sedation)

Prognosis

Recovery is variable: many patients improve in the first 6-12 weeks, around half recover by 6 months, but a substantial proportion still report symptoms at 1 year. Estimated risk of chronic pain is about 20-40%, with poorer outcomes linked to high initial pain, reduced early range of motion, psychological distress/PTSD features, and negative expectations of recovery.

Sources & References

✅NICE Guidelines(1)

📖Textbook References(5)

  • Netter F. Netter Atlas of Human Anatomy. A Systems Approach 8ed 2022.pdf(pp. 2041, 2042)[context]
  • Netter F. Netter Atlas of Human Anatomy. A Systems Approach 8ed 2022.pdf(pp. 2042, 2043)[context]
  • Netter F. Netter Atlas of Human Anatomy. A Systems Approach 8ed 2022.pdf(pp. 2041, 2042)[context]
  • _OceanofPDF.com_Netters_Anatomy_-_8th_edition_-_Frank_H_Netter_MD.pdf(pp. 2041, 2042)[context]
  • _OceanofPDF.com_Netters_Anatomy_-_8th_edition_-_Frank_H_Netter_MD.pdf(pp. 2041, 2042)[context]

Sources

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