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Updated: Mar 8, 2026

An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field
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    This study presents a novel method to reduce inertial sensor drift in motion capture for dynamic sports. By utilizing mutual information between multiple sensors, it improves the accuracy of 3-D segment orientations and joint angles.

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    Area of Science:

    • Biomechanics
    • Sports Science
    • Sensor Technology

    Background:

    • Inertial sensor drift is a common issue in motion capture, typically addressed at the individual sensor level.
    • Existing methods struggle with highly dynamic movements found in sports, leading to inaccuracies in orientation and joint angle estimation.

    Purpose of the Study:

    • To introduce a new method for drift-reduced estimation of 3-D segment orientations and joint angles using multiple inertial sensor units.
    • To enhance motion capture accuracy for highly dynamic sports movements by exploiting inter-sensor information.

    Main Methods:

    • A novel algorithm maps 3-D acceleration from adjacent segments to the connecting joint.
    • Drift is estimated and mitigated by analyzing vector orientation differences of mapped accelerations in the global frame.
    • The method was validated using alpine ski racing data, comparing 3-D segment orientations and joint angles to a multicamera reference system.

    Main Results:

    • The algorithm achieved mean accuracy and precision below 3.9° and 6.0° for specific leg angles and trunk segment inclination.
    • These error levels are comparable to those reported for less dynamic movements in other studies.
    • Drift was found to increase axis misalignment, particularly affecting highly flexed joints like the knee and hip during dynamic maneuvers.

    Conclusions:

    • The proposed multi-sensor approach effectively reduces inertial sensor drift in motion capture for dynamic sports.
    • The method provides accurate and precise estimations of segment orientations and joint angles, even during challenging movements like alpine ski racing.
    • Further improvements may focus on mitigating drift effects on highly flexed joints.