Sessumpun K, et al. - Researchers assessed how each type of sagittal cervical alignment affected the motion of the upper and subaxial cervical spine using kinematic magnetic resonance imaging. All parts of the cervical motion complex were affected by sagittal malalignment of the cervical spine. Kinematic properties of the occipito-atlanto-axial complex and upper thoracic spine were affected by the global kyphotic alignment of subaxial cervical spine to compensate for the alteration of cervical alignment. In straight and segmental kyphosis, these differences were not seen. Greater range of motion of the entire cervical spine and subaxial cervical spine in younger patients was demonstrated by the dynamic evaluation.