Cervical spine injury is the orthopaedic injury that primary care, sports medicine, and emergency clinicians cannot afford to miss. The cervical spine carries the head, transmits the spinal cord, and tolerates very little error - a missed unstable fracture can cause permanent quadriplegia or death. Recognition depends on a small number of clinical decision rules, a low threshold for imaging, and clear emergency pathways anchored to NICE NG41 and BOAST 2025 (Assessment of the Spine in the Trauma Patient). The approach is rule-based at point of contact: NG41 uses the Canadian C-spine rule to identify low-risk patients in whom the spine can be cleared clinically; everyone else gets imaging. CT is first-line in adults aged 16 or over; MRI follows for cord, root, ligamentous, or persistent neurological concerns. Mechanisms range from elderly low-energy falls (commonly producing odontoid peg fractures) to high-energy sport and road traffic injuries.
The cervical spine has seven vertebrae divided functionally into the upper cervical (occiput-C1-C2) and the subaxial spine (C3-C7). The upper cervical complex provides most rotation (around 50% at the atlanto-axial joint) and flexion-extension at the atlanto-occipital joint. The subaxial spine carries the brunt of axial loading, with the dens (odontoid peg) of C2 sitting within the ring of C1 and held by the transverse atlantal ligament.
Stability is best understood in cervical-specific terms rather than the thoracolumbar Denis three-column framework: upper cervical ligament integrity (especially the transverse atlantal ligament), subaxial alignment, vertebral body morphology, the disco-ligamentous complex, facet joint integrity, and neurological status. Specialist classifications (AO Spine subaxial cervical, SLIC scoring) guide formal stability assessment.
Named injuries to know:
High-yield mechanisms. Hyperflexion: anterior wedge, flexion teardrop, bilateral facet dislocation. Hyperextension: Hangman's, extension teardrop, elderly Type II odontoid. Axial load: Jefferson burst (C1), subaxial burst. Flexion-rotation: unilateral facet dislocation.
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