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Nowadays, People safe driving is one the greatest concerns of health authorities. Having mentioned to this issue, we must predict effective criterions in Vehicle crash injuries. In case of the crash, Belts usually can decrease damages unless a high speed crash occurs, Belts expose occupants to be hurt because of head rotation. Dummies are commonly believed to be the remarkable surrogate of a human body in crash tests. Cost a fortune, time-consuming and being unrepeatable make us use of finite-element analysis (FEA) to simulate the various components of spine injuries. The aims of this study were to calculate cervical vertebra's stress distribution in case of front impact with free rotational movement of the head (without considering the interaction of the body's head to steer, dashboard and so on).