This study hypothesized that cervical spine immobilization (CSI) in penetrating cervical trauma is associated with increased central neurologic injury rather than prevention. Data abstraction proceeded from a previously constructed patient database formed via retrospective chart analysis of the trauma registries of two independent American College of Surgeons verified Level 1 Trauma centers. Neurologic injuries were categorized as peripheral or central. Central neurologic injuries were further subdivided into spinal cord and brain injuries. Patients were grouped according to the presence and type of neurologic injury, the presence and type of cervical spine fracture, death, and the presence or absence of respiratory and vascular injury. Vascular injury was further subdivided into major and minor categories. Groups were compared statistically. Significance was accepted for p<0.05. Cervical spine fracture (CSFx) was a significant risk factor for cervical spinal cord injury (CSCI) (p<0.00001; RR 20.56; 95% CI 8.44-26.47) but all patients with unstable CSFx presented with complete spinal neurologic devastation. Major vascular injury was associated with brain injury (p=0.01; RR 10.21; 95% CI 6.67-15.65) but was not associated with CSCI (p=0.99) or CSFx (p=0.67). Hypoperfusion was a strong independent risk cervical cord and brain injury (p<0.00001; RR 38.4; 95% CI 16.17-91.2). CSI was a significant risk factor for indirect central neurologic injury (p<0.001; RR 1.63; 95% CI 1.23-1.95). Brain injury was not associated with CSFx (p=0.35) or CSCI (p=0.08). No benefit of CSI in penetrating cervical trauma could be determined from this study. CSI entailed an absolute risk increase for central neurologic injury of 18.69% with a 5.3 number needed to harm (NNH).