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Evaluating the Feasibility of Electrical Impedance Tomography for Monitoring Knee Angle and Muscle Strength: Towards Application in Total Knee Replacement Rehabilitation

Liang, L; Yao, T; Tehrany, R; Player, D; Carlson, T; Demosthenous, A; Wu, Y; (2025) Evaluating the Feasibility of Electrical Impedance Tomography for Monitoring Knee Angle and Muscle Strength: Towards Application in Total Knee Replacement Rehabilitation. In: Proceedings IEEE International Symposium on Circuits and Systems. (pp. pp. 1-5). IEEE: London, UK. Green open access

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Abstract

Rehabilitation following total knee replacement (TKR) principally aims to reduce pain and restore knee muscle strength and function, which necessitates objective monitoring. Given the growing interest in wearable technologies for rehabilitation, this paper investigates the feasibility of using electrical impedance tomography (EIT) to monitor and estimate muscle activity, specifically focusing on resultant knee angle (KA) and muscle strength (MS). A data collection system was designed to simultaneously capture EIT data, kinematic and physiological reference data, namely KA and MS, followed by two experiments. Data processing methods, such as region of interest (ROI) selection and modelling of the correlation between EIT and reference data, were used to assess feasibility. The results indicate that the long short-term memory (LSTM) model achieved an R<sup>2</sup> value of 0.97, suggesting a strong correlation between the EIT data and KA. While EIT demonstrated potential in detecting KA, it did not show effectiveness in capturing changes in muscle activity and MS during isometric contractions.

Type: Proceedings paper
Title: Evaluating the Feasibility of Electrical Impedance Tomography for Monitoring Knee Angle and Muscle Strength: Towards Application in Total Knee Replacement Rehabilitation
Event: 2025 IEEE International Symposium on Circuits and Systems (ISCAS)
Dates: 25 May 2025 - 28 May 2025
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/ISCAS56072.2025.11043497
Publisher version: https://doi.org/10.1109/iscas56072.2025.11043497
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: Electrical impedance tomography , Correlation , Pain , Bioimpedance , Muscles , Data models , Knee replacement , Biomedical monitoring , Monitoring , Long short term memory
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci > Department of Ortho and MSK Science
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci > Department of Targeted Intervention
URI: https://discovery.ucl.ac.uk/id/eprint/10211646
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