title: The centre of rotation of the shoulder complex and the effect of normalisation.
abstract: 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.
authors.affiliation: Department of Bioengineering, Imperial College London, London, United Kingdom. Electronic address: celia.amabile@ensam.eu.
authors.forename: Celia
authors.initials: C
authors.lastname: Amabile
authors.affiliation: Department of Bioengineering, Imperial College London, London, United Kingdom. Electronic address: a.bull@imperial.ac.uk.
authors.forename: Anthony M J
authors.initials: AMJ
authors.lastname: Bull
authors.affiliation: Department of Bioengineering, Imperial College London, London, United Kingdom. Electronic address: akedgley@imperial.ac.uk.
authors.forename: Angela E
authors.initials: AE
authors.lastname: Kedgley
mesh_terms: D000173:Acromioclavicular Joint / Q000502:physiology; D000328:Adult; D005260:Female; D006225:Hand / Q000502:physiology; D006801:Humans; D008297:Male; D009068:Movement; D012399:Rotation; D012782:Shoulder / Q000502:physiology; D012785:Shoulder Joint / Q000502:physiology*; D055815:Young Adult
keywords: Centre of rotation; Normalisation; Shoulder