Inter-session reliability of markerless lower extremity joint kinematics and kinetics for return-to-sport screening tasks

Xu, J ORCID: 0000-0002-4714-3880, Wen, Z, Augustine, S, Sharir, R, De Bleecker, C, Robinson, MA ORCID: 0000-0002-5627-492X, Jamkrajang, P, Smeets, A and Vanrenterghem, J (2025) Inter-session reliability of markerless lower extremity joint kinematics and kinetics for return-to-sport screening tasks. Journal of Sports Sciences. pp. 1-15. ISSN 0264-0414

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Abstract

Evaluating movement quality in dynamic tasks is vital in return-to-sport (RTS) decision-making, yet marker-based motion capture (MoCap) can be complex. This study assessed the inter-session reliability of lower extremity joint kinematics and kinetics obtained using Theia3D, a markerless MoCap solution, during dynamic RTS screening tasks. Eighteen healthy participants performed six tasks over two sessions. Joint kinematics and kinetics were evaluated for absolute reliability between sessions, for discrete values and time-varying profiles. Test–retest reliability was evaluated using (integrated) intraclass correlation coefficient (ICC), standard error of measurement (SEM), and minimal detectable change (MDC). With few exceptions, integrated ICC values of joint angular displacements and moments showed moderate-to-excellent reliability (0.61–0.86 and 0.62–0.90 for angles in the sagittal and frontal plane, respectively; 0.54–0.88 and 0.51–0.85 for moments). SEM values for joint angles were low, indicating minimal session-to-session variation for kinematics. However, most MDC values were relatively high compared to expected intervention effects, particularly showing that kinetic measurements may not yet accurately detect clinically meaningful changes. Overall, these findings thus support the markerless MoCap’s potential for tracking lower extremity dynamics during RTS screening, particularly for kinematics and sagittal plane kinetics, but highlight limited inter-session reliability for frontal plane kinetic parameters at the hip and ankle.

Item Type:	Article
Additional Information:	This is an Accepted Manuscript version of the following article, accepted for publication in Journal of Sports Sciences. Xu, J., Wen, Z., Augustine, S., Sharir, R., De Bleecker, C., Robinson, M. A., … Vanrenterghem, J. (2025). Inter-session reliability of markerless lower extremity joint kinematics and kinetics for return-to-sport screening tasks. Journal of Sports Sciences, 1–15. https://doi.org/10.1080/02640414.2025.2541490. It is deposited under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License (Deed - Attribution-NonCommercial-NoDerivatives 4.0 International - Creative Commons), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way.
Uncontrolled Keywords:	4201 Allied Health and Rehabilitation Science; 42 Health Sciences; 4207 Sports Science and Exercise; 1106 Human Movement and Sports Sciences; 1302 Curriculum and Pedagogy; Sport Sciences; 3202 Clinical sciences; 4207 Sports science and exercise; 5201 Applied and developmental psychology
Subjects:	R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions:	Sport and Exercise Sciences
Publisher:	Taylor and Francis Group
Date of acceptance:	24 July 2025
Date Deposited:	14 Aug 2025 08:13
Last Modified:	14 Aug 2025 08:15
DOI or ID number:	10.1080/02640414.2025.2541490
URI:	https://researchonline.ljmu.ac.uk/id/eprint/26936

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