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Background: Spinal motion restriction (SMR) after traumatic injury has been a mainstay of prehospital trauma care for more than 3 decades. Recent guidelines recommend a selective approach with cervical spine clearance in the field when criteria are met., Materials and Methods: In January 2014, the Department of Health Services of the City of Los Angeles, California, implemented revised guidelines for cervical SMR after blunt mechanism trauma. Adult patients (aged ≥18 y) with an initial Glasgow Coma Scale (GCS) score of ≥13 presented to a single level I trauma center after blunt mechanism trauma over the following 1-y period were retrospectively reviewed. Demographics, injury data, and prehospital data were collected. Cervical spine injury (CSI) was identified by International Classification of Disease, Ninth Revision, codes., Results: Emergency medical services transported 1111 patients to the emergency department who sustained blunt trauma. Patients were excluded if they refused c-collar placement or if documentation was incomplete. A total of 997 patients were included in our analysis with 172 (17.2%) who were selective cleared of SMR per protocol. The rate of Spinal Cord Injury was 2.2% (22/997) overall and 1.2% (2/172) in patients without SMR. The sensitivity and specificity of the protocol are 90.9% (95% confidence interval: 69.4-98.4) and 17.4% (95% confidence interval: 15.1-20.0), respectively, for CSI. Patients with CSI who arrived without immobilization having met field clearance guidelines, were managed without intervention, and had no neurologic compromise., Conclusions: Guidelines for cervical SMR have high sensitivity and low specificity to identify CSI. When patients with injuries were not placed on motion restrictions, there were no negative clinical outcomes., (Copyright © 2016 Elsevier Inc. All rights reserved.)