WOMAC, EQ-5D and Knee Society Score Thresholds for Treatment Success After Total Knee Arthroplasty

J Arthroplasty. 2015 Dec;30(12):2154-8. doi: 10.1016/j.arth.2015.06.012. Epub 2015 Jun 14.


Our study aimed at developing clinical thresholds (cut-off scores) for the Western Ontario and McMaster Universities (WOMAC) osteoarthritis index, EQ-5D and Knee Society Score for discriminating between patients with and without treatment success following total knee arthroplasty (TKA). We performed a retrospective analysis of 1055 patients 2 months after TKA and 765 patients 1 year after TKA. We considered treatment successful if the patient reported high levels of satisfaction and pain relief, functional increase, and a willingness to undergo the same procedure again. Based on this criterion we identified cut-off scores that will facilitate interpretation of the WOMAC, the EQ-5D and the KSS in TKA patients.

Keywords: EQ-5D; Knee Society Score; WOMAC; patient-reported outcome; total knee arthroplasty; treatment success.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Arthroplasty, Replacement, Knee / adverse effects
  • Arthroplasty, Replacement, Knee / statistics & numerical data*
  • Female
  • Humans
  • Knee Joint / surgery
  • Male
  • Middle Aged
  • Ontario
  • Osteoarthritis, Knee / diagnosis
  • Osteoarthritis, Knee / surgery*
  • Patient Satisfaction / statistics & numerical data*
  • Retrospective Studies
  • Severity of Illness Index*
  • Treatment Outcome