Validation of wearable visual feedback for retraining foot progression angle using inertial sensors and an augmented reality headset

Angelos Karatsidis (Corresponding Author), Rosie E. Richards, Jason M. Konrath, Josien C. van den Noort, H. Martin Schepers, Giovanni Bellusci, Jaap Harlaar, Petrus H. Veltink

    Research output: Contribution to journalArticleAcademicpeer-review

    20 Citations (Scopus)
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    Abstract

    Background
    Gait retraining interventions using real-time biofeedback have been proposed to alter the loading across the knee joint in patients with knee osteoarthritis. Despite the demonstrated benefits of these conservative treatments, their clinical adoption is currently obstructed by the high complexity, spatial demands, and cost of optical motion capture systems. In this study we propose and evaluate a wearable visual feedback system for gait retraining of the foot progression angle (FPA).

    Methods
    The primary components of the system are inertial measurement units, which track the human movement without spatial limitations, and an augmented reality headset used to project the visual feedback in the visual field. The adapted gait protocol contained five different target angles ranging from 15 degrees toe-out to 5 degrees toe-in. Eleven healthy participants walked on an instrumented treadmill, and the protocol was performed using both an established laboratory visual feedback driven by optical motion capture, and the proposed wearable system.

    Results and conclusions
    The wearable system tracked FPA with an accuracy of 2.4 degrees RMS and ICC=0.94 across all target angles and subjects, when compared to an optical motion capture reference. In addition, the effectiveness of the biofeedback, reflected by the number of steps with FPA value ±2 degrees from the target, was found to be around 50% in both wearable and laboratory approaches. These findings demonstrate that retraining of the FPA using wearable inertial sensing and visual feedback is feasible with effectiveness matching closely an established laboratory method. The proposed wearable setup may reduce the complexity of gait retraining applications and facilitate their transfer to routine clinical practice.
    Original languageEnglish
    Article number78
    Number of pages12
    JournalJournal of neuroengineering and rehabilitation
    Volume15
    Issue number1
    DOIs
    Publication statusPublished - 15 Aug 2018

    Keywords

    • Foot progression angle
    • Inertial Sensors
    • Real-time biofeedback
    • Augmented reality headset
    • Gait retraining
    • Knee osteoarthritis

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