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Effects of attachment position and shoulder orientation during calibration on the accuracy of the acromial tracker

Shaheen, AF, Alexander, CM and Bull, AMJ (2011) Effects of attachment position and shoulder orientation during calibration on the accuracy of the acromial tracker JOURNAL OF BIOMECHANICS, 44 (7). 1410 - 1413. ISSN 0021-9290

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Abstract

The acromial tracker is used to measure scapular rotations during dynamic movements. The method has low accuracy in high elevations and is sensitive to its attachment location on the acromion. The aim of this study was to investigate the effect of the attachment position and shoulder orientation during calibration on the tracker accuracy. The tracker was attached to one of three positions: near the anterior edge of the acromion process, just above the acromial angle and the meeting point between the acromion and the scapular spine. The scapula locator was used to track the scapula during bilateral abduction simultaneously. The locator was used to calibrate the tracker at: no abduction, 30°, 60°, 90° and 120° humerothoracic abduction. ANOVA tests compared RMS errors for different attachment positions and calibration angles. The results showed that attaching the device at the meeting point between the acromion and the scapular spine gave the smallest errors and it was best to calibrate the device at 60° for elevations ≤90°, at 120° for elevations >90° and at 90°or 120° for the full range of abduction. The accuracy of the tracker is significantly improved if attached appropriately and calibrated for the range of movement being measured.

Item Type: Article
Additional Information: NOTICE: this is the author’s version of a work that was accepted for publication inJournal of Biomechanics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Biomechanics, 44(7), April 2011, DOI 10.1016/j.jbiomech.2011.01.013
Uncontrolled Keywords: Science & Technology, Life Sciences & Biomedicine, Technology, Biophysics, Engineering, Biomedical, Engineering, Scapula, Kinematics, Acromial tracker, Attachment position, Calibration angle, SCAPULAR MOTION, KINEMATICS, MOVEMENT, MARKER, PLANE
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Divisions: Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Depositing User: Symplectic Elements
Date Deposited: 01 Oct 2012 19:15
Last Modified: 23 Sep 2013 19:38
URI: http://epubs.surrey.ac.uk/id/eprint/719214

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