The centre of rotation of the shoulder complex and the effect of normalisation

Shoulder motions consist of a composite movement of three joints and one pseudo-joint, which together dictate the humerothoracic motion. The purpose of this work was to quantify the location of the centre of rotation (CoR) of the shoulder complex as a whole. Dynamic motion of 12 participants was rec...

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Main Authors:	Amabile, Celia, Bull, Anthony M.J., Kedgley, Angela E.
Format:	Online
Language:	English
Published:	Elsevier Science 2016
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4894247/

id	pubmed-4894247
recordtype	oai_dc
spelling	pubmed-48942472016-06-14 The centre of rotation of the shoulder complex and the effect of normalisation Amabile, Celia Bull, Anthony M.J. Kedgley, Angela E. Short Communication Shoulder motions consist of a composite movement of three joints and one pseudo-joint, which together dictate the humerothoracic motion. The purpose of this work was to quantify the location of the centre of rotation (CoR) of the shoulder complex as a whole. Dynamic motion of 12 participants was recorded using optical motion tracking during coronal, scapular and sagittal plane elevation. The instantaneous CoR was found for each angle of elevation using helical axes projected onto the three planes of motion. The location of an average CoR for each plane was evaluated using digitised and anthropometric measures for normalisation. When conducting motion in the coronal, scapular, and sagittal planes, respectively, the coefficients for locating the CoRs of the shoulder complex are −61%, −61%, and −65% of the anterior–posterior dimension – the vector between the midpoint of the incisura jugularis and the xiphoid process and the midpoint of the seventh cervical vertebra and the eighth thoracic vertebra; 0%, −1%, and −2% of the superior–inferior dimension – the vector between the midpoint of the acromioclavicular joints and the midpoint of the anterior superior iliac spines; and 57%, 57%, and 78% of the medial–lateral dimension −0.129 times the height of the participant. Knowing the location of the CoR of the shoulder complex as a whole enables improved participant positioning for evaluation and rehabilitation activities that involve movement of the hand with a fixed radius, such as those that employ isokinetic dynamometers. Elsevier Science 2016-06-14 /pmc/articles/PMC4894247/ /pubmed/27048984 http://dx.doi.org/10.1016/j.jbiomech.2016.03.035 Text en © 2016 The Authors http://creativecommons.org/licenses/by/4.0/ This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Amabile, Celia Bull, Anthony M.J. Kedgley, Angela E.
spellingShingle	Amabile, Celia Bull, Anthony M.J. Kedgley, Angela E. The centre of rotation of the shoulder complex and the effect of normalisation
author_facet	Amabile, Celia Bull, Anthony M.J. Kedgley, Angela E.
author_sort	Amabile, Celia
title	The centre of rotation of the shoulder complex and the effect of normalisation
title_short	The centre of rotation of the shoulder complex and the effect of normalisation
title_full	The centre of rotation of the shoulder complex and the effect of normalisation
title_fullStr	The centre of rotation of the shoulder complex and the effect of normalisation
title_full_unstemmed	The centre of rotation of the shoulder complex and the effect of normalisation
title_sort	centre of rotation of the shoulder complex and the effect of normalisation
description	Shoulder motions consist of a composite movement of three joints and one pseudo-joint, which together dictate the humerothoracic motion. The purpose of this work was to quantify the location of the centre of rotation (CoR) of the shoulder complex as a whole. Dynamic motion of 12 participants was recorded using optical motion tracking during coronal, scapular and sagittal plane elevation. The instantaneous CoR was found for each angle of elevation using helical axes projected onto the three planes of motion. The location of an average CoR for each plane was evaluated using digitised and anthropometric measures for normalisation. When conducting motion in the coronal, scapular, and sagittal planes, respectively, the coefficients for locating the CoRs of the shoulder complex are −61%, −61%, and −65% of the anterior–posterior dimension – the vector between the midpoint of the incisura jugularis and the xiphoid process and the midpoint of the seventh cervical vertebra and the eighth thoracic vertebra; 0%, −1%, and −2% of the superior–inferior dimension – the vector between the midpoint of the acromioclavicular joints and the midpoint of the anterior superior iliac spines; and 57%, 57%, and 78% of the medial–lateral dimension −0.129 times the height of the participant. Knowing the location of the CoR of the shoulder complex as a whole enables improved participant positioning for evaluation and rehabilitation activities that involve movement of the hand with a fixed radius, such as those that employ isokinetic dynamometers.
publisher	Elsevier Science
publishDate	2016
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4894247/
_version_	1613589281342750720

The centre of rotation of the shoulder complex and the effect of normalisation

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