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Standard RUS skeletal maturation of Tokyo children

K Ashizawa1, T Asami, M Anzo

  • 1Laboratory of Growth and Ergonomics, Otsuma Women's University, Tokyo, Japan.

Annals of Human Biology
|November 1, 1996
PubMed
Summary
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Japanese children exhibit rapid skeletal maturation during puberty, reaching adult skeletal maturity 1-2 years earlier than other populations. This study establishes a new skeletal maturity standard for Japanese children.

Area of Science:

  • Orthopedics
  • Pediatric Endocrinology
  • Anthropology

Background:

  • Accurate assessment of skeletal maturity is crucial for diagnosing growth disorders and planning orthopedic interventions.
  • Existing skeletal maturity standards may not accurately reflect the developmental trajectories of diverse populations.

Purpose of the Study:

  • To develop a specific skeletal maturity standard for Japanese children using the RUS (TW2) method.
  • To compare the skeletal maturation patterns of Japanese children with other international standards.

Main Methods:

  • Radiographs of the left hand and wrist were obtained from 704 girls and 753 boys aged 3-18 years in Tokyo.
  • Skeletal maturity scores were estimated using the RUS (TW2) method, and 50th-centile curves were generated using cubic spline functions.

Related Experiment Videos

  • A Japanese TW2 RUS skeletal maturity standard (TW2-J RUS) was established.

    • Main Results:

    • Japanese children demonstrate accelerated skeletal maturation during puberty, particularly after ages 9 for girls and 11 for boys.
    • Peak differences in skeletal maturity scores between adjacent age groups occurred at 12.5 years for girls and 14.5 years for boys.
    • Japanese children attain adult skeletal maturity approximately 1-2 years earlier than children in British, Belgian, southern Chinese, and northern Indian populations.

    Conclusions:

    • The developed TW2-J RUS standard provides a more accurate assessment of skeletal maturity for Japanese children.
    • The findings highlight significant ethnic variations in skeletal maturation timing, emphasizing the need for population-specific standards.