Value of Canadian C-spine rule versus the NEXUS criteria in ruling out clinically important cervical spine injuries: derivation of modified Canadian C-spine rule.

Purpose: Although, Canadian C-spine rule and the National Emergency X-Radiography Utilization Study (NEXUS) criteria in ruling out clinically important cervical spine injuries have been validated using large prospective studies, no consensus exist as to which rule should be endorsed. Therefore, the aim of the present study was to compare the accuracy of the Canadian C-spine and NEXUS criteria in ruling out clinically important cervical spine injuries in trauma patients. Finally, we introduced the modified Canadian C-spine rule.

Methods: A prospective diagnostic accuracy study was conducted on trauma patients referred to four emergency departments of Iran in 2018. Emergency physicians evaluated the patients based on the Canadian C-spine rule and NEXUS criteria in two groups of low risk and high risk for clinically important cervical spine injury. Afterward, all patients underwent cervical imaging. In addition, modified Canadian C-spine rule was derived by removing dangerous mechanism and simple rear-end motor vehicle collision from the model.

Results: Data from 673 patients were included. The area under the curve of the NEXUS criteria, Canadian C-spine, and modified Canadian C-spine rule were 0.76 [95% confidence interval (CI) 0.71-0.81)], 0.78 (95% CI 0.74-0.83), and 0.79 (95% CI 0.74-0.83), respectively. The sensitivities of NEXUS criteria, Canadian C-spine, and modified Canadian C-spine rule were 93.4%, 100.0% and 100.0%, respectively.

Conclusions: The modified Canadian C-spine rule has fewer variables than the original Canadian C-spine rule and is entirely based on physical examination, which seems easier to use in emergency departments.