Cervical Spine Clearance Protocol

Imaging Requirements

Complete visualization from skull base through C7-T1 junction is required for high-quality CT scans, with axial slice thickness <3mm (ideally 1.5-2mm) and sagittal and coronal reconstructions 1, 2, 3
Directed CT of C1-C2 (craniocervical junction) detects fractures in an additional 10% of patients with normal plain films, and directed CT of C7-T1 (cervicothoracic junction) detects fractures in another 10% of patients 4
The risk of isolated ligamentous injury in blunt polytrauma patients ranges from 0.1-0.7%, consistently under 1% 3, 5, 4

Plain radiographs alone are inadequate and dangerous, missing approximately 15% of cervical injuries, with three-view cervical series still missing up to 10% of injuries 4, 6
The functional sensitivity of an adequate three-view series is only 89.4% 1, 2, 6
The cervicothoracic junction (where up to 60% of injuries occur) cannot be visualized in up to 49% of plain films even with arm traction 6

Complications escalate rapidly after 48-72 hours of collar immobilization, including pressure sores, increased intracranial pressure, life-threatening airway complications, aspiration pneumonia, and thromboembolic events 7
Rigid cervical collars paradoxically may not prevent injury progression, and may cause paradoxical movement at the craniocervical and cervicothoracic junctions—the two most common injury sites 7

MRI is very sensitive for soft tissue injury but not validated for routine clearance, with a high false-positive rate and significant failure rate at upper and posterior cervical spine 8
Dynamic fluoroscopy involves passive flexion/extension under real-time imaging in sedated, paralyzed patients, but has a questionable clinical yield with a number needed to treat (NNT) of 295-500 to detect significant injuries 3, 4, 8

Failure to properly immobilize a cervical spine fracture increases secondary neurological injury ten‑fold, with delayed or missed diagnosis leading to neurological deterioration in 10.5 % of patients versus 1.4 % when immobilization is adequate, and permanent neurological deficits occur in up to 29.4 % of cases. 9

Up to 4.3 % of all cervical fractures are initially missed; of these missed injuries, 67 % progress to neurological deterioration when immobilization is inadequate. 9
Prior to widespread adoption of spinal precautions, approximately 10 % of patients who were neurologically intact on presentation developed neurological deficits during emergency care because of inadequate immobilization. 9

The greatest risk for secondary injury occurs when patients are mobilized or inadequately immobilized before a definitive diagnosis is established, especially within the first 72 hours after trauma. 9

Isolated ligamentous cervical injuries are identified in fewer than 1 % of cases, but failure to immobilize these injuries can result in progressive instability and delayed neurological injury. 10

For neurologically intact patients with stable burst fractures of the thoracolumbar spine, bracing may be optional; however, this exception does not apply to cervical spine fractures, which require continued immobilization until fracture stability is confirmed by imaging. [11][12]