By Dr. Abdolghader Pakniyat
Use selective precautions while deciding who needs imaging and when the cervical spine can be cleared. The approach below separates blunt from penetrating injury and adult from paediatric clearance.
Protect the cord and the patient
A collar does not correct hypoxaemia or shock. During trauma resuscitation, secure oxygenation, ventilation and perfusion while supporting the potentially injured spine. A device that obstructs airway care must not delay treatment; maintain manual support while adjusting or removing it. NICE spinal-injury guidance.
Spinal motion restriction (SMR) limits unnecessary movement; it cannot make an unstable injury mechanically secure. Cord injury can worsen through tissue damage, swelling and inadequate blood flow. The clinical task is to combine careful handling with resuscitation, examination and timely imaging, rather than equating a fitted collar with protection.
What the evidence can establish
The 2025 NAEMSP evidence review found no definitive clinical benefit from immobilisation and identified device-related harms. It argues for reducing collars and limiting boards and full-body vacuum splints to active extrication. This is a review-based recommendation, not a trial proving that every no-device strategy is safe.
The 2018 joint EMS/trauma statement supports selective SMR with a correctly fitted collar and body support. The 2024 WMS guideline takes a different, wilderness-specific approach that avoids routine rigid collars and boards. These documents should not be merged into one universal equipment prescription. Biomechanical reductions in motion do not establish improved neurological outcomes.
Select patients after blunt trauma
Maintain precautions when there is midline neck or back pain, weakness or sensory change, spinal deformity, altered consciousness, intoxication, or another barrier to a reliable assessment. Look beyond the neck: cervical clearance does not clear the thoracic or lumbar spine. Document limb motor and sensory findings before and after transfers. Joint statement.
Older patients can sustain important injuries after low-energy falls. In an eligible patient, age 65 or older is a Canadian C-spine high-risk criterion. Known ankylosing disease, fixed kyphosis or previous spinal surgery should trigger a tailored assessment; do not force the patient into a new alignment to fit a device. NICE assessment guidance.
Penetrating injury is a different problem
For adults with isolated penetrating trauma, do not add routine SMR or delay haemorrhage control and transport for a collar or board. EAST recommends against routine prehospital immobilisation: available observational studies show no neurological benefit and an association with higher mortality, but cannot establish that immobilisation caused the excess deaths.
A penetrating wound does not exclude a concurrent blunt mechanism. Assess that separately. Neurological deficits still require urgent spinal assessment; avoiding routine devices does not mean ignoring a cord injury.
Recognise device-related harm
Hard surfaces and tight devices concentrate pressure; prolonged use can injure skin. Collars may hinder airway access and venous drainage, while restrictive positioning can impair breathing. Pain and agitation can increase movement rather than control it. These harms support frequent reassessment, not an unsupported claim that collars always worsen outcome. NAEMSP review.
Check airway access, ventilation, skin, fit and comfort after application. Do not accept worsening neurological symptoms or respiratory compromise as the price of maintaining a device. Treat pain and reassess the patient and the support strategy.
Use boards for transfer, not prolonged care
Coordinate transfers with trained staff, supporting head, neck and trunk together. Remove the extrication board promptly when safe; no universal ten-minute deadline applies. A collar alone cannot support the entire spine. 2018 joint statement.
A young child’s large occiput may flex the neck when supine. Pad beneath shoulders and torso as needed for alignment. Paediatric positioning guidance.
Awake adult: apply one complete decision rule
NEXUS: clinical clearance requires all five low-risk findings: normal alertness, no intoxication, no posterior midline cervical tenderness, no focal neurological deficit and no painful distracting injury. A positive criterion means the rule cannot exclude injury; it does not diagnose a fracture. Original NEXUS study.
Canadian C-spine rule: use in alert, stable patients aged 16 or older after blunt trauma, within its eligibility criteria. Age 65 or older, a dangerous mechanism or limb paraesthesia mandates imaging. Otherwise, a qualifying simple rear-end collision, sitting in the ED, walking after injury, delayed neck pain or absent midline tenderness permits range-of-motion assessment. If none applies, image. If eligible for testing, inability to actively turn 45 degrees each way requires imaging. Do not test rotation before completing the preceding steps or force movement. Use the complete validated rule, including dangerous-mechanism definitions. The derivation study excluded pregnancy, acute paralysis, known vertebral disease or cervical surgery, delayed presentations beyond 48 hours and reassessment of the same injury.
Neither rule is a clearance pathway for an obtunded patient, penetrating trauma or the thoracolumbar spine. Do not assume that walking, normal limb movement or absence of pain alone excludes cervical injury.
Intoxicated or obtunded adult: an imaging pathway
Intoxication prevents NEXUS clinical clearance. It does not automatically require hours in a collar after adequate imaging. The prospective WTA intoxication study supports CT-based clearance in adult blunt trauma, using an agreed pathway and a documented neurological assessment; its excellent diagnostic performance is not a guarantee against interpretation error.
For obtunded adults after blunt trauma, EAST conditionally supports collar removal after a negative high-quality cervical CT alone. The underlying evidence is very low quality. Confirm scan adequacy, final interpretation and the absence of a concerning clinical–imaging mismatch; apply the trauma service’s clearance protocol. This adult recommendation should not be extrapolated to children.
A normal CT does not dismiss abnormal neurology
When cervical imaging is indicated in an adult, CT is the initial test. It evaluates fractures and alignment but cannot exclude every cord or ligament injury. Persistent weakness, sensory change or another finding suggesting cord injury requires specialist review and MRI after CT, even when CT shows no explanatory abnormality. NICE imaging recommendations.
This distinction matters in an older patient with a stenotic cervical canal: a cord syndrome can coexist with an apparently normal fracture screen. In a prospective intoxicated cohort, central cord syndromes were identified on examination and one unstable ligament injury was initially misread on CT. Bush et al., 2016.
For persistent pain without neurological findings, reassess the patient and scan quality under the local clearance pathway. Do not equate pain alone with instability, or send every CT-negative patient automatically for MRI.
Children need a paediatric pathway
The 2024 PECARN study enrolled children aged 0–17 after blunt trauma. Its proposed algorithm directs children with severe impaired consciousness, abnormal airway/breathing/circulation findings or focal neurological deficits toward CT consideration. Neck pain, lesser altered mental status, substantial head or torso injury, and midline neck tenderness support radiography when high-risk findings are absent.
Validation sensitivity was 94.3%, not 100%; the study was performed in specialist children’s emergency departments. Apply the complete paediatric pathway with clinical judgement and reassessment, especially in preverbal children. Do not use the absence of a verbal pain report as clearance. Abnormal neurology warrants specialist assessment for cord injury even without an evident fracture.
Before transfer or discharge
Record why precautions were started or stopped, examination reliability, neurological findings, imaging interpretation and the clinician responsible for clearance. If uncertainty or a deficit remains, maintain appropriate support and arrange specialist assessment or transfer rather than leaving an indefinite collar plan.
After clearance, explain the plan and give return instructions for new weakness, numbness, gait difficulty or bladder/bowel dysfunction. The practical endpoint is an assessed, resuscitated patient with a clear disposition, not simply removal of the board.
Selected references
Fischer et al. Joint SMR statement, 2018; Hawkins et al. WMS guideline, 2024; Millin et al. NAEMSP review, 2025.
Hoffman et al. NEXUS, 2000; Stiell et al. Canadian C-spine rule, 2001; Leonard et al. PECARN, 2024.
EAST penetrating-trauma guideline, 2018; EAST obtunded-adult clearance guideline, 2015; Martin et al. WTA intoxication study, 2017; Bush et al. CT clearance study, 2016; NICE NG41.
