Three-dimensional alignment changes of the shoulder girdle between the supine and standing positions.
Clavicle rotation
Scapula rotation
Scapulothoracic joint
Shoulder girdle
Shoulder girdle alignment
Upright computed tomography
Journal
Journal of orthopaedic surgery and research
ISSN: 1749-799X
Titre abrégé: J Orthop Surg Res
Pays: England
ID NLM: 101265112
Informations de publication
Date de publication:
15 Sep 2020
15 Sep 2020
Historique:
received:
08
05
2020
accepted:
31
08
2020
entrez:
16
9
2020
pubmed:
17
9
2020
medline:
22
5
2021
Statut:
epublish
Résumé
Although humans spend most of their day in a standing or sitting position, it is difficult to accurately evaluate the alignment of the shoulder girdle during daily activity, and its alignment changes between positions. The purpose of this study was to evaluate the 3-dimensional alignment of the shoulder girdle in the supine and standing positions by computed tomography (CT) and to assess the alignment changes of the shoulder girdle between these two positions. CT scans of both shoulders of 100 healthy volunteers were prospectively taken in both supine and standing positions on the same day. The local 3-dimensional coordinate systems of the thorax, clavicle, and scapula were defined from the specific bony landmarks, and 3-dimensional angular rotations and positions of the clavicle and scapula were calculated. Differences in rotations and positions of the clavicle and scapula were evaluated between the supine and standing positions. Compared with the supine position, the clavicle showed significantly less elevation and greater retraction, and the scapula showed significantly less upward rotation, anterior tilting, and internal rotation in the standing position. Compared with the supine position, the clavicle center was located more inferiorly, posteriorly, and laterally, and the scapula center was located more inferiorly, posteriorly, and medially in the standing position. The present study showed that angular rotations and positions of the clavicle and scapula change significantly with position due to the effect of gravity.
Sections du résumé
BACKGROUND
BACKGROUND
Although humans spend most of their day in a standing or sitting position, it is difficult to accurately evaluate the alignment of the shoulder girdle during daily activity, and its alignment changes between positions. The purpose of this study was to evaluate the 3-dimensional alignment of the shoulder girdle in the supine and standing positions by computed tomography (CT) and to assess the alignment changes of the shoulder girdle between these two positions.
METHODS
METHODS
CT scans of both shoulders of 100 healthy volunteers were prospectively taken in both supine and standing positions on the same day. The local 3-dimensional coordinate systems of the thorax, clavicle, and scapula were defined from the specific bony landmarks, and 3-dimensional angular rotations and positions of the clavicle and scapula were calculated. Differences in rotations and positions of the clavicle and scapula were evaluated between the supine and standing positions.
RESULTS
RESULTS
Compared with the supine position, the clavicle showed significantly less elevation and greater retraction, and the scapula showed significantly less upward rotation, anterior tilting, and internal rotation in the standing position. Compared with the supine position, the clavicle center was located more inferiorly, posteriorly, and laterally, and the scapula center was located more inferiorly, posteriorly, and medially in the standing position.
CONCLUSIONS
CONCLUSIONS
The present study showed that angular rotations and positions of the clavicle and scapula change significantly with position due to the effect of gravity.
Identifiants
pubmed: 32933527
doi: 10.1186/s13018-020-01934-w
pii: 10.1186/s13018-020-01934-w
pmc: PMC7491173
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
411Subventions
Organisme : Japan Society for the Promotion of Science
ID : 17H04266
Organisme : Japan Society for the Promotion of Science
ID : 20K08056
Organisme : Japan Society for the Promotion of Science
ID : 17K16482
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