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Journal of Healthcare Engineering
Volume 2017, Article ID 2941048, 7 pages
Research Article

The Influence of Natural Head Position on the Cervical Sagittal Alignment

1Shi’s Center of Orthopedics and Traumatology, Shuguang Hospital Affiliated to Shanghai University of TCM, Shanghai 201203, China
2Tongji Hospital, Tongji University School of Medicine, Shanghai 200092, China
3Baoshan Branch, Shuguang Hospital Affiliated to Shanghai University of TCM, Shanghai 201900, China
4Institute of Traumatology & Orthopedics, Shanghai Academy of TCM, Shanghai 201203, China

Correspondence should be addressed to Huihao Wang; moc.621@gnawoahiuh and Hongsheng Zhan; moc.361@0102gnehsgnohnahz

Received 24 March 2017; Revised 6 June 2017; Accepted 3 July 2017; Published 13 August 2017

Academic Editor: Wei Yao

Copyright © 2017 Kuan Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Introduction. This study investigated the relationship between the parameters related to the natural head position and cervical segmental angles and alignment of patients with neck pain. Material and Methods. The lateral radiographs of the cervical spine were collected from 103 patients and were used to retrospectively analyze the correlation between the natural head position, cervical local sagittal angles, and alignment. Sagittal measurements were as follows: cervical curvature classification, slope of McGregor’s line (McGS), local sagittal angles (C0–C2 angle, C2–C5 angle, C5–C7 angle, and C2–C7 angle), T1 slope, center of gravity of the head to sagittal vertical axis (CG–C7 SVA), and local sagittal alignment (C0–C2 SVA and C2–C7 SVA). Results. McGS was significantly correlated to C0–C2 angle (), C0–C2 SVA (), C2–C7 SVA (), and CG–C7 SVA (). CG–C7 SVA was also significantly correlated to curvature type (), C5–C7 angle (), and C2–C7 angle (). Conclusions. A backward shift with an extended head position may accompany a relatively normal curvature of the cervical spine. The effect of posture control in relieving abnormal mechanical state of the cervical spine needs to be further confirmed by biomechanical analysis.