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Growth plate activity in the upper extremity.

J W Pritchett

    Clinical Orthopaedics and Related Research
    |July 1, 1991
    PubMed
    Summary

    Growth in the humerus, radius, and ulna is not equally distributed across growth plates. Bone growth patterns vary by age and sex, with females exhibiting earlier maturation than males.

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    Area of Science:

    • Orthopedics
    • Pediatric Bone Growth
    • Skeletal Development

    Background:

    • Understanding long bone growth is crucial for diagnosing skeletal dysplasias and planning orthopedic interventions.
    • The nutrient foramen serves as a reliable landmark for measuring growth contributions from different epiphyseal plates.
    • Previous studies have not comprehensively detailed the differential contributions of specific growth centers to overall limb length.

    Purpose of the Study:

    • To quantify the proportional contribution of each growth center to the total length of the humerus, radius, and ulna.
    • To analyze age- and sex-specific variations in growth plate activity.
    • To establish normative data for upper extremity bone growth in a healthy pediatric population.

    Main Methods:

    • Analysis of anteroposterior and lateral roentgenograms from 200 healthy American subjects (males and females).
    • Measurement of bone growth at each epiphyseal plate relative to the fixed nutrient foramen landmark.
    • Stratification of data by age groups and sex to identify growth patterns.

    Main Results:

    • Growth contributions are unequal across the proximal and distal growth plates of the humerus, radius, and ulna.
    • Growth plate activity is dynamic and not constant throughout the developmental period.
    • Females demonstrate accelerated skeletal maturation, with growth occurring 1-2 years earlier than in males.
    • The humerus shows approximately 80% overall growth at the proximal plate, increasing with age.
    • The ulna and radius exhibit significant distal growth contributions, exceeding 80-95% by late childhood.

    Conclusions:

    • Limb bone elongation is a complex process with differential contributions from various growth centers.
    • Age- and sex-dependent growth patterns necessitate tailored approaches in pediatric orthopedic assessments.
    • This study provides quantitative data on upper extremity growth, valuable for clinical and research applications.

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