Predicting normative walking biomechanics across the lifespan using seven simple features.
Bernard X W Liew, Rachel Senden, David Rugamer and 5 others
PMID 41137130WHAT IT FOUND
Seven simple clinical measures can predict normal walking biomechanics across the lifespan, but accuracy varies by variable.
Sagittal plane joint angles and ground reaction forces were predicted well, while transverse plane angles were poor. Use these reference models with caution for non-sagittal movements.
Key findings
01Models predicted sagittal plane joint angles with errors ranging from 4.71° to 7.97°, which exceeded the hypothesized threshold of 5°.
02Prediction accuracy was best for sagittal plane joint angles and poorest for transverse plane angles, where relative error reached 50.72%.
03Joint moments and ground reaction forces were predicted with high accuracy, with root mean squared errors of 0.09 to 0.15 Nm/kg and 0.02 to 0.07 N/kg respectively.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
Data were collected during treadmill walking, which differs from overground walking and may affect the generalizability of the normative references. The models did not account for ethnicity, psychological factors, or bone torsion, which can influence biomechanics. Prediction accuracy was poor for transverse plane angles, limiting the utility of the tool for assessing rotational movements. The study used a train-test split validation, which is more conservative than leave-one-subject-out methods used in prior studies, potentially affecting direct comparisons of accuracy metrics.
Declared interests
Bernard Liew is funded by the Medical Research Council and Innovate UK. No commercial conflicts of interest were declared.
The easy way to misread this
Do not use these models to assess transverse plane joint angles or hip axial rotation, as the prediction error was high (relative RMSE 50.72%). Additionally, the root mean squared error for sagittal angles exceeded the minimal detectable change threshold of 5°, so small deviations in these angles may not represent true impairment.
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