Subluxation of the cervical spine caused by 3-point seat belt.

Cervical spine injuries associated with 3-point (lap-sash) seat belt restraint systems are uncommon and usually without serious sequelae. However, the potential for unstable subluxation or dislocation due to severe flexion-extension mechanism is present and may result in severe disability if not promptly recognized and treated. Such an unstable injury is reported here and was treated with internal fixation. Further attention should be given to the ability of headrests, air bags, and other restraints to protect the cervical spine.