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An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field
06:52

An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field

Published on: May 26, 2020

Normal ranges of hip motion of infants between nine and 24 months of age

E Phelps, L J Smith, A Hallum

    Developmental Medicine and Child Neurology
    |December 1, 1985
    PubMed

    Insights

    Hip range of motion in healthy infants changes significantly with age. Hip extension limitation decreases, and rotation values normalize as children grow, impacting abduction.

    Area of Science:

    • Pediatrics
    • Orthopedics
    • Developmental Biology

    Background:

    • Infant hip joint development is crucial for motor function.
    • Understanding normal ranges of motion is essential for identifying developmental abnormalities.

    Purpose of the Study:

    • To quantify changes in hip range of motion in healthy infants.
    • To establish normative data for hip extension, internal rotation, external rotation, and abduction from 9 to 24 months of age.

    Main Methods:

    • Measurements of hip extension limitation, internal rotation, external rotation, and abduction were taken.
    • A sample of 86 healthy infants aged 9, 12, 18, and 24 months was studied.
    • Statistical analysis was performed to identify significant changes and correlations.

    Main Results:

    • Significant changes were observed in hip extension limitation, internal rotation, and external rotation.
    • Hip extension limitation decreased from 10 degrees at 9 months to 3 degrees at 24 months.
    • External rotation initially exceeded internal rotation but became similar with age; correlations were found between extension limitation, rotation, and abduction.

    Conclusions:

    • Infant hip range of motion undergoes significant developmental changes.
    • Normative data indicate a decrease in hip extension limitation and a normalization of rotation with age.
    • These findings provide a baseline for assessing pediatric hip development and identifying potential issues.

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