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Normalization of the Constant score.

Leonid I Katolik1, Anthony A Romeo, Brian J Cole

  • 1Department of Health, Primary Care, University of Washington, Seattle, USA.

Journal of Shoulder and Elbow Surgery
|May 13, 2005
PubMed
Summary
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Normal shoulder strength varies by gender and age. This study established age- and gender-adjusted normal values for the Constant score, improving shoulder outcome evaluations.

Area of Science:

  • Orthopedics
  • Shoulder Biomechanics
  • Geriatric Medicine

Background:

  • Shoulder strength and function, assessed by the Constant score, can vary significantly with gender and age.
  • Absolute Constant score values may decrease with age, potentially misrepresenting normal shoulder function.
  • Establishing population-specific normative data is crucial for accurate interpretation of shoulder assessment scores.

Purpose of the Study:

  • To determine age- and gender-specific normative values for the Constant score in a healthy shoulder population.
  • To provide a benchmark for evaluating shoulder function that accounts for demographic variations.
  • To enhance the accuracy of shoulder outcome assessments in clinical practice.

Main Methods:

  • Analysis of data from 441 patients presenting for non-shoulder conditions.

Related Experiment Videos

  • Collection of subjective questionnaire data, range of motion, and strength measurements.
  • Statistical determination of Constant score norms stratified by age and gender.

    • Main Results:

    • Significant differences in mean Constant scores were observed between men and women across all age groups (P < .05).
    • Significant age-related declines in Constant scores were noted within both genders (P < .05).
    • Normative Constant score values, adjusted for age and gender, were successfully determined.

    Conclusions:

    • The Constant score's interpretation must consider age and gender to accurately reflect normal shoulder function.
    • The developed adjusted Constant score provides a reliable measure of gender- and age-matched shoulder function.
    • This normative data is valuable for precise evaluation of shoulder outcomes in diverse patient populations.