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Validity and reliability of a sensor-based electronic spinal mobility index for axial spondyloarthritis

Gardiner, PV; Small, D; Muñoz-Esquivel, K; Condell, J; Cuesta-Vargas, A; Williams, J; Machado, PM; (2020) Validity and reliability of a sensor-based electronic spinal mobility index for axial spondyloarthritis. Rheumatology , 59 (11) pp. 3415-3423. 10.1093/rheumatology/keaa122. Green open access

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Abstract

OBJECTIVE: To evaluate the validity and reliability of inertial measurement unit (IMU) sensors in the assessment of spinal mobility in axial spondyloarthritis (axSpA). METHODS: A repeated measures study design involving 40 participants with axSpA was used. Pairs of IMU sensors were used to measure the maximum range of movement at the cervical (Cx) and lumbar (Lu) spine. A composite IMU score was defined by combining the IMU measures. Conventional metrology and physical function assessment were performed. Validation was assessed considering the agreement of IMU measures with conventional metrology and correlation with physical function. Reliability was assessed using intra-class correlation coefficients (ICCs). RESULTS: The composite IMU score correlated closely (r = 0.88) with the BASMI. Conventional Cx rotation and lateral flexion tests correlated closely with IMU equivalents (r = 0.85, 0.84). All IMU movement tests correlated strongly with BASFI, while this was true for only some of the BASMI tests. The reliability of both conventional and IMU tests (except for chest expansion) ranged from good to excellent. Test-retest ICCs for individual conventional tests varied between 0.57 and 0.91, in comparison to a range from 0.74 to 0.98 for each of the IMU tests. Each of the composite regional IMU scores had excellent test-retest reliability (ICCs=0.94-0.97), comparable to the reliability of the BASMI (ICC=0.96). CONCLUSION: Cx and Lu spinal mobility measured using wearable IMU sensors is a valid and reliable assessment in multiple planes (including rotation), in patients with a wide range of axSpA severity.

Type: Article
Title: Validity and reliability of a sensor-based electronic spinal mobility index for axial spondyloarthritis
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/rheumatology/keaa122
Publisher version: https://doi.org/10.1093/rheumatology/keaa122
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: axial spondyloarthritis, inertial measurement unit, reliability, sensor, spinal mobility
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Department of Neuromuscular Diseases
URI: https://discovery.ucl.ac.uk/id/eprint/10096700
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