Hyperflexion injuries of the human cervical spine occur in the vehicular crash environment, contact sports, and accidental falls. Hyperflexion of the head-neck is a violent movement when head-neck is forced to bend forward into extremely position. It often causes injuries to the posterior ligamentous tissues and instability of the lower cervical spine. Cervical spine injuries are frequently associated with head impact. Our previous experimental studies have demonstrated that alignment variation of the head-neck complex with respect to a similar external load vector significantly alters the injury mechanisms and biomechanical response variables (3, 4). Determining the correlation among the alignment condition, spinal column configuration, biomechanical responses, and injury mechanisms can assist the evaluation of injury risks and preventive measures. The present in vitro experimental study was conducted to delineate the biodynamic parameters associated with hyperflexion injury of the cervical spine.

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