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Title: Concurrent validity and reliability of a mobile tracking technology to measure angular and linear movements of the neck
Authors : Sommer, Bettina B.
Weisenhorn, Martin
Ernst, Markus J.
Meichtry, André
Rast, Fabian M.
Kleger, Dominik
Schmid, Philipp
Lünenburger, Lars
Bauer, Christoph M.
et. al : No
Published in : Journal of Biomechanics
Pages : 109340
Publisher / Ed. Institution : Elsevier
Issue Date: Sep-2019
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (publication)
Language : English
Subject (DDC) : 616.7: Diseases of musculoskeletal system and orthopaedics
Abstract: The neck can be moved in six degrees of freedom. Current 3D-optoelectronic motion-capture systems capable of measuring these movements are inappropriate for use in clinical practice because they are stationary, expensive and time-consuming. We therefore developed a less complex 3D-tracking technology based on Steam®VR to measure six degrees of freedom in a clinical setting. The aim of this study was to assess the validity and reliability of this system. The developed prototype consists of two infrared-emitting lighthouses and sensors, mounted on the participant’s helmet and trunk belt, to detect the orientation of the head and trunk. The system was evaluated by means of an infrared light-reflecting marker tracking system. Twenty healthy participants, equipped with these sensors and markers, performed thirteen neck movement tasks. Linear and angular movements were measured. These tasks were repeated after six to eight days to assess test-retest reliability. Concurrent validity was assessed by the root mean square error, and reliability with generalizability theory. With an average root mean square error between 1.2 and 2.0° in angular and 0.4–0.5 cm in linear movements, the prototype was shown to precisely track these movements. Reliability of the prototype and the reference system was comparable for all tasks. A high contribution of participant’s variability to the observed variance was generally detected, with the exception of joint repositioning error and upper cervical flexion. The reliability was task-specific and did not differ between the systems. The prototype system was shown to be valid, although the reliability of the repositioning and upper cervical flexion tests needs to be reconsidered.
Departement: Health Professions
Organisational Unit: Institute of Physiotherapy (IPT)
Publication type: Article in scientific journal
DOI : 10.1016/j.jbiomech.2019.109340
ISSN: 0021-9290
Published as part of the ZHAW project : Valedo Nackentherapie
Appears in Collections:Publikationen Gesundheit

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