The cervical region of spinal column has been known as a frequent site of injuries. The major causes of injuries are vehicle accidents and sports. Clinical instability is known as one of the important topics in cervical spine research. It clarifies the relation between the mechanical dysfunction of the spine and the neurologic dysfunction and pain. From the clinical point of view, if the spinal segment exhibits abnormal large increase in rotational or translational displacements under physiological load, it is considered as unstable. There are different biomechanical models available to understand the underlying mechanisms of injury and dysfunction. Finite element (FE) models have been used as a strong tool to provide the basic insights into the workings of the cervical spine system. Furthermore, they have been clinically useful in the development of the definition of clinical instability and of diagnostic guidelines [1].

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