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

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

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Department of Psychiatry and Psychotherapy, Medical University of Innsbruck, Innsbruck, Austria.
Department of Orthopaedic Surgery, University of Edinburgh, Edinburgh, UK.
Department of Orthopaedics and Traumatology, Kantonsspital St. Gallen, St. Gallen, Switzerland.


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.


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

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