Evidence map›Paper›PMID 34038861›Full record

ArticleJournal of biomechanics2021

In vivo primary and coupled segmental motions of the healthy female head-neck complex during dynamic head axial rotation.

Runsheng Guo, Chaochao Zhou, Cong Wang, Tsung-Yuan Tsai, Yan Yu, Wei Wang, Guoan Li, Thomas Cha

Abstract read
In one paragraph

Article in Journal of biomechanics, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
8citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

8 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
  2. In vivo three-dimensional kinematics of the upper cervical spine during upright head rotation in patients with atlantoaxial dislocation.European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society · 2026
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors.

Runsheng GuoOrthopaedic Bioengineering Research Center, Newton-Wellesley Hospital, Newton, MA, USA; Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA; Department of Orthopaedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China.
Chaochao ZhouOrthopaedic Bioengineering Research Center, Newton-Wellesley Hospital, Newton, MA, USA; Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
Cong WangSchool of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China.
Tsung-Yuan TsaiSchool of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China.
Yan YuDepartment of Spine Surgery, Tongji Hospital, Tongji University School of Medicine, Shanghai, China.
Wei WangOrthopaedic Bioengineering Research Center, Newton-Wellesley Hospital, Newton, MA, USA; Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
Guoan LiOrthopaedic Bioengineering Research Center, Newton-Wellesley Hospital, Newton, MA, USA. Electronic address: gli1@partners.org.
Thomas ChaOrthopaedic Bioengineering Research Center, Newton-Wellesley Hospital, Newton, MA, USA; Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.

Funding

Evaluating adjacent segment biomechanics after ACDF or TDR surgery in cervical spondylosis patients.R03AG056897 · NIA · MASSACHUSETTS GENERAL HOSPITAL · PI CHA, THOMAS D · 2018 to 2019
$128k
NIA NIH HHS R03 AG056897
6 · The paper itself

Abstract

While previous studies have greatly improved our knowledge on the motion capability of the cervical spine, few reported on the kinematics of the entire head-neck complex (C0-T1) during dynamic activities of the head in the upright posture. This study investigated in vivo kinematics of the entire head-neck complex (C0-T1) of eight female asymptomatic subjects during dynamic left-right head axial rotation using a dual fluoroscopic imaging system and 3D-to-2D registration techniques. During one-sided head rotation (i.e., left or right head rotation), the primary rotation of the overall head-neck complex (C0-T1) reached 55.5 ± 10.8°, the upper cervical spine region (C0-2) had a primary axial rotation of 39.7 ± 9.6° (71.3 ± 8.5% of the overall C0-T1 axial rotation), and the lower cervical spine region (C2-T1) had a primary rotation of 10.0 ± 3.7° (18.6 ± 7.2% of the overall C0-T1 axial rotation). Coupled bending rotations occurred in the upper and lower cervical spine regions in similar magnitude but opposite directions (upper: contralateral bending of 18.2 ± 5.9° versus lower: ipsilateral bending of 21.4 ± 5.1°), resulting in a compensatory cervical lateral curvature that balances the head to rotate horizontally. Furthermore, upper cervical segments (C0-1 or C1-2) provided main mobility in different rotational degrees of freedom needed for head axial rotations. Additionally, we quantitatively described both coupled segmental motions (flexion-extension and lateral bending) by correlation with the overall primary axial rotation of the head-neck complex. This investigation offers comprehensive baseline data regarding primary and coupled motions of craniocervical segments during head axial rotation.

Indexed as

Cervical VertebraeNeckBiomechanical PhenomenaFemaleHumansMotionRange of Motion, ArticularCervical segmentsCompensatory lateral curvatureDynamic head rotationHead-neck complexIn vivoSegmental motion

Identifiers

PMID34038861
PMCPMC8227877

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.