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Knee scores in a 'normal' elderly population.

A T Bremner-Smith1, P Ewings, A E Weale

  • 1Avon Orthopaedic Centre, Southmead Hospital, Westbury-on-Trym, Bristol BS10 5NB, UK.

The Knee
|July 21, 2004
PubMed
Summary

This study assessed common knee scores in healthy older adults. Age and medical conditions negatively impact knee function scores, suggesting these factors should be considered when evaluating knee replacement outcomes.

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Area of Science:

  • Orthopedics
  • Geriatric Medicine
  • Health Outcomes Research

Background:

  • Numerous knee scoring instruments exist for assessing outcomes post-knee replacement surgery.
  • The reliability of these scores in a general elderly population without prior lower limb issues is not well-established.
  • Understanding baseline scores in a healthy cohort is crucial for accurate outcome interpretation.

Purpose of the Study:

  • To evaluate the three most frequently used knee scores in the United Kingdom within a 'normal' elderly population.
  • To establish normative data for the Oxford Knee Score (OKS), Bristol Knee Score (BKS), and American Knee Society Score (AKSS) in this demographic.
  • To identify demographic factors influencing these knee scores in the absence of knee pathology.

Main Methods:

  • A community-based study involving 100 elderly volunteers (mean age 72 years) with no history of knee, hip, spine, or lower limb disorders.
  • Administration of the Oxford Knee Score (OKS), Bristol Knee Score (BKS), and American Knee Society Score (AKSS) to all participants.
  • Statistical analysis to determine correlations between knee scores and demographic variables such as age and presence of coexistent medical conditions.

Main Results:

  • Normalised median scores for OKS, BKS, and AKSS were high, at 97%, 96%, and 98% respectively.
  • Significant negative correlations were observed between knee scores and increasing age (P<0.001).
  • The presence of 'major' medical conditions also showed a significant negative correlation with knee scores (P<0.001), particularly affecting the 'function' component.

Conclusions:

  • Knee scores in a healthy elderly population are generally high but are negatively influenced by age and comorbidities.
  • The 'function' subscale of these scoring instruments appears most sensitive to demographic variations.
  • When comparing outcomes after knee replacement using these scores, it is essential to account for patient demographics like age and overall health status.

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