Table 2.

Spearman rank correlation between KOOS change scores and the anchor questions reported at 12, 26, and 52 weeks.

VariablesWalking AnchorKnee Health Anchor
Pain
  12-week unilateral−0.391**−0.373**
  12-week bilateral−0.331**−0.287**
  26-week unilateral−0.376**−0.375**
  26-week bilateral−0.453**−0.455**
  52-week unilateral−0.412**−0.437**
  52-week bilateral−0.349**−0.332**
Other symptoms
  12 week−0.229**−0.209**
  26 week−0.277**−0.288**
  52 week−0.314**−0.325**
ADL
  12 week−0.291**−0.279**
  26 week−0.335**−0.345**
  52 week−0.502**−0.471**
Sport and recreation
  12 week0.0460.066
  26 week−0.128−0.138
  52 week−0.168−0.144
Knee-related QOL
  12-week WJR−0.195−0.163
  12-week non-WJR−0.288**−0.283**
  26-week WJR−0.253*−0.233*
  26-week non-WJR−0.222**−0.278**
  52-week WJR−0.584**−0.494**
  52-week non-WJR−0.366**−0.392**

  • ↵* Correlation significant at 0.05 level.

  • ↵** Correlation significant at 0.01 level.

  • KOOS: Knee injury and Osteoarthritis Outcome Score; ADL: activities of daily living; QOL: quality of life; WJR: waitlisted for joint replacement.