Longitudinal Changes in Midrange Cervical Spine Kinematics After Anterior Cervical Arthrodesis
نویسندگان
چکیده
INTRODUCTION: The etiology of adjacent segment pathology following anterior cervical arthrodesis remains controversial. In vitro studies consistently report that adjacent segment maximal range of motion (ROM) increases superior and inferior to cervical arthrodesis. Previous in vivo results have been conflicting, indicating that maximal ROM may or may not increase superior and/or inferior to the arthrodesis. These previous studies fail to evaluate midrange motion, which makes of the majority of activities of daily living. Further, all previous reports focus exclusively on the planar flexion/extension motion and therefore no data exist to characterize adjacent segment motion during multi-planar head rotation. The objective of this study was to compare maximal and midrange intervertebral ROM in asymptomatic control subjects and single-level arthrodesis patients longitudinally. It was hypothesized that maximal and midrange adjacent segment ROM would increase with time after surgery and that maximal and midrange adjacent segment ROM would be greater than ROM at the corresponding motion segments in similar-aged asymptomatic controls.
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