Apply the Canadian C-Spine Rule to decide imaging in alert, stable blunt trauma patients. Step 1: Any high-risk factor (age 65 or older, dangerous mechanism, paresthesias)? Imaging required. Step 2: Any low-risk factor allowing safe ROM assessment? Proceed to Step 3. Step 3: Can patient actively rotate neck 45 degrees left and right? No imaging needed. Sensitivity 100%, specificity 42%.
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