Using fresh cadaveric C4-C7 specimens, multidirectional flexibility was measured at all vertebral levels, before and after the fixator application at C4-C5, C5-C6, and C4-C6. There is controversy regarding the relationship between the changes in spinal motion and clinical instability. To evaluate the biomechanical effects of applying a cervical external fixator to a patient using an in vitro model. Three-dimensional flexibility changes due to the application of an external fixator at C4-C5 were studied in cervical spine specimens.
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