Abstract: To review the researches of in-vivo kinematics after cervical arthrodesis. Related literature concerning the kinematics in patients after cervical arthrodesis was extensively reviewed and comprehensively analyzed in 4 terms of changes in adjacent segment range of motion , motion segment percent contributions, motion pattern of cervical facet joints, and deviated center of rotation at adjacent segments. These reported researches of in-vivo kinematics after cervical arthrodesis was almost on the sagittal plane. Few data have been reported on the 6-DOF kinematics under physiological loading conditions. Whether adjacent segment pathology caused by hypermobility remains controversial. Long-term follow-up of large sample randomized controlled studies and obtaining the accurate 6-DOF kinematics are the best way to resolve controversy.

Key words: Anterior cervical decompression and fusion, In-vivo kinematics, Adjacent segment pathology, Congenital cervical fusion