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Ultrasonographic hip morphometry in infants

J C Cheng1, Y L Chan, P W Huí

  • 1Department of Orthopaedics and Traumatology, Faculty of Medicine, Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, N.T.

Journal of Pediatric Orthopedics
|January 1, 1994
PubMed
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This study found that infant boys have better hip development than girls, with improved hip containment evident by 4 months. Measurements were consistent between longitudinal and cross-sectional infant hip ultrasonography.

Area of Science:

  • Pediatric Orthopedics
  • Diagnostic Imaging

Background:

  • Normal hip development is crucial for long-term musculoskeletal health.
  • Ultrasonography is a key imaging modality for assessing infant hip morphometry.
  • Establishing normative data is essential for identifying developmental hip dysplasia.

Purpose of the Study:

  • To ultrasonographically assess hip morphometry in normal infants from birth to 6 months.
  • To compare hip development parameters between sexes and between longitudinal and cross-sectional study designs.
  • To evaluate intraobserver variability in hip ultrasonographic measurements.

Main Methods:

  • A cross-sectional ultrasonographic study of 926 hips in 463 normal infants (birth to 6 months).
  • A longitudinal study of 52 infants with serial hip measurements.

Related Experiment Videos

  • Measurement of Graf's alpha and beta angles, Morin's head coverage percentage, and femoral head size.

    • Main Results:

    • Boys exhibited higher alpha angles, lower beta angles, better head coverage, and larger head sizes compared to girls.
    • Hip containment increased significantly within the first 4 months of life.
    • No statistically significant differences were found between longitudinal and cross-sectional data.
    • Intraobserver variability was lowest for alpha angle measurements (SD 3.22 degrees).

    Conclusions:

    • Ultrasonography provides reliable data for assessing normal infant hip development.
    • Boys demonstrate distinct hip morphometric characteristics compared to girls during the first 6 months.
    • The rapid increase in hip containment by 4 months highlights a critical developmental window.