Musculoskeletal · Cervical Spine Disorders
The facts most likely to be tested
Cervical strain is a diagnosis of exclusion characterized by paraspinal muscle tenderness and decreased range of motion following a mechanical injury.
Patients typically present with non-radicular neck pain and stiffness that is exacerbated by movement and relieved by rest.
The neurologic examination is consistently normal in cervical strain, with no focal motor, sensory, or reflex deficits.
Plain film radiography is indicated only if the patient meets Canadian C-Spine Rule criteria, such as age >65, dangerous mechanism, or inability to rotate the neck 45 degrees.
First-line management consists of conservative therapy including NSAIDs, muscle relaxants, and early return to gentle range-of-motion exercises.
Cervical collars are generally discouraged for long-term use as they may lead to muscle atrophy and delayed recovery.
Red flags requiring urgent imaging include fever, unexplained weight loss, night pain, or progressive neurologic deficits suggestive of malignancy or infection.
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A 28-year-old male presents to the urgent care clinic complaining of stiff neck and posterior cervical pain that began after a minor rear-end motor vehicle collision yesterday. He denies any numbness, tingling, or weakness in his upper extremities. Physical examination reveals tenderness to palpation of the bilateral trapezius and paraspinal muscles with limited cervical rotation due to pain. His neurologic exam is intact with 5/5 strength in all muscle groups and symmetric deep tendon reflexes. He is able to rotate his neck 50 degrees to the left and right.
What is the most appropriate next step in management?
Conservative management with NSAIDs and early mobilization
The patient meets none of the Canadian C-Spine Rule criteria for imaging, and the clinical presentation is classic for cervical strain; therefore, conservative treatment is the standard of care.
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Etiology / Epidemiology
Commonly caused by hyperextension-hyperflexion injury (whiplash) or poor posture. Affects all ages, most frequent in motor vehicle accidents.
Clinical Manifestations
Presents with paraspinal muscle tenderness and stiff neck. Absence of neurological deficits is the key diagnostic feature.
Diagnosis
Diagnosis is clinical. X-ray is indicated only to rule out fracture using Canadian C-Spine Rules.
Treatment
First-line is NSAIDs and early mobilization. Avoid prolonged cervical collar use to prevent muscle atrophy.
Prognosis
Most patients recover within 6-12 weeks. Chronic pain occurs in <10% of cases.
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Epidemiology & Etiology
Cervical strain is a soft tissue injury resulting from sudden acceleration-deceleration forces, most commonly seen in rear-end collisions. Chronic cases are frequently linked to ergonomic strain and repetitive occupational stress. It is the most common diagnosis following whiplash trauma.
Pertinent Anatomy
The cervical spine relies on the sternocleidomastoid and trapezius muscles for stability. Injury typically involves the musculotendinous units rather than the bony vertebrae or intervertebral discs. Understanding the cervical lordosis is essential, as loss of this curve is a common radiographic finding in acute spasm.
Pathophysiology
The mechanism involves micro-tearing of muscle fibers and ligaments due to rapid force transmission. This triggers an inflammatory cascade leading to muscle spasm and localized edema. The resulting guarding reflex limits range of motion to protect the injured segment.
Clinical Manifestations
Patients report occipital headache and diffuse neck pain radiating to the shoulders. Physical exam reveals decreased range of motion and trigger points. Red flags include radiculopathy, Lhermitte's sign, or bowel/bladder dysfunction, which mandate immediate imaging to rule out cord compression.
Diagnosis
Diagnosis is primarily clinical based on history and physical exam. X-ray (AP/Lateral/Odontoid) is the gold standard for excluding fracture, guided by the Canadian C-Spine Rules. MRI is reserved for patients with persistent neurological deficits or suspected disc herniation.
Treatment
Management focuses on NSAIDs for pain and inflammation. Patients should maintain early range of motion exercises rather than strict immobilization. Prolonged use of cervical collars is contraindicated as it delays recovery. Muscle relaxants may be used short-term for severe spasms.
Prognosis
Prognosis is excellent, with 90% of patients achieving full resolution within 3 months. Persistent symptoms beyond 6 months suggest chronic pain syndrome or underlying structural pathology requiring physical therapy referral.
Differential Diagnosis
Cervical Disc Herniation: presence of radiculopathy and positive Spurling's test
Cervical Fracture: history of high-energy trauma and midline bony tenderness
Cervical Spondylosis: chronic onset with osteophyte formation on imaging
Tension Headache: absence of neck trauma and presence of band-like distribution
Meningitis: presence of fever, photophobia, and nuchal rigidity