September 10, 2025Journal of BiomechanicsOpen Access

Concurrent validity of IMU and phone-based markerless systems for lower-limb kinematics during cognitively-challenging landing tasks

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IMU and phone-based systems provide comparable kinematic waveforms for lower-limb movements, with significant variability noted.
Knee flexion showed low error (NRMSE ≤ 10%), but hip rotation lacked agreement, indicating system limitations.
Bland-Altman plots and statistical mapping revealed varying degrees of validity across different joints and planes.
Findings point to the potential of IMU-based systems, although full kinematic accuracy, especially in the transverse plane, remains uncertain.

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Concurrent validity of IMU and markerless systems for lower-limb kinematics was evaluated, highlighting distinct accuracy differences.

Bertozzi et al. (2025) studied this question.

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