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The hamstring index

L Kuo1, W Chung, E Bates

  • 1Department of Paediatric Orthopaedics, Prince of Wales Children's Hospital, Randwick, New South Wales, Australia.

Journal of Pediatric Orthopedics
|January 1, 1997
PubMed
Summary
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This study assessed hamstring tightness in children using three common tests. Results established age-specific normal ranges, identifying significant tightness when specific angle or distance measurements are not met.

Area of Science:

  • Pediatrics
  • Orthopedics
  • Sports Medicine

Background:

  • Hamstring tightness is a common concern in pediatric populations.
  • Establishing normative data for hamstring flexibility across different age groups is crucial for clinical assessment.
  • Previous research has not comprehensively evaluated common hamstring tightness tests in a large pediatric cohort.

Purpose of the Study:

  • To assess the limits of hamstring tightness in 369 children.
  • To establish age-specific reference values for three common hamstring flexibility tests.
  • To investigate correlations between hamstring tightness, ligamentous laxity, and puberty.

Main Methods:

  • Utilized three common clinical tests: straight leg-raise, popliteal angle, and touching-toes test.

Related Experiment Videos

  • Recruited 369 children for the study.
  • Analyzed data to determine age-related changes and establish normative limits for each test.

    • Main Results:

    • Established age-specific normal ranges for straight leg-raise (birth: 100°, 1yr: 110°, 5-6yr: 80°), popliteal angle (birth-2yr: 180°, 6yr: 155°), and touching-toes test (minimal variation, < -5cm or <-15cm indicates tightness).
    • Defined criteria for hamstring tightness based on age-specific angles and distances.
    • Observed less hamstring tightness in girls and a positive correlation with ligamentous laxity, but no association with puberty.

    Conclusions:

    • Provided age-specific normative data for evaluating hamstring tightness in children using the straight leg-raise, popliteal angle, and touching-toes tests.
    • Highlighted the importance of age-appropriate interpretation of hamstring flexibility measurements.
    • Suggested that ligamentous laxity, but not puberty, is associated with hamstring tightness in children.