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Related Experiment Videos

Load on knee joint structures and muscular activity during lifting.

J Ekholm, R Nisell, U P Arborelius

    Scandinavian Journal of Rehabilitation Medicine
    |January 1, 1984
    PubMed
    Summary

    Lifting with straight knees generates an extending knee moment, while bent-knee lifts initially create a flexing knee moment. This study compares knee joint loading during different lifting techniques.

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    Area of Science:

    • Biomechanics
    • Ergonomics
    • Knee Joint Loading

    Background:

    • Knee joint loading during lifting is understudied compared to low back load.
    • Lifting techniques significantly influence biomechanical stress.

    Purpose of the Study:

    • To compare knee joint loading during three distinct lifting techniques.
    • To analyze the biomechanical and ergonomic implications of different lifting postures.

    Main Methods:

    • Healthy subjects performed floor-to-table lifts with a 12.8-kg box using straight knees, bent knees with the box in front, and bent knees with the box between.
    • A computerized static sagittal plane model calculated knee joint moments.
    • Electromyography recorded quadriceps and ischiocrural muscle activity.

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    Main Results:

    • Bent-knee lifts initiated with a ~50 Nm flexing knee moment and 90-degree knee angle.
    • Straight-knee lifts consistently produced an extending knee moment.
    • All lift types concluded with a ~55 Nm extending knee moment and 0-degree knee angle.

    Conclusions:

    • Different lifting techniques result in distinct knee joint loading patterns.
    • Understanding these biomechanical differences is crucial for injury prevention and ergonomic recommendations.