• Nicholas D Clement, Deborah Macdonald, and Richard Burnett.
• Department of Orthopaedics and Trauma, The Royal Infirmary of Edinburgh, Little France, Edinburgh, UK. nickclement@doctors.org.uk
• Arch Orthop Trauma Surg. 2013 May 1;133(5):689-94.

ObjectivesThe aim of this study was to identify threshold values in the pre- and post-operative Oxford knee score (OKS), and change in the score for differing levels of patient satisfaction with their total knee replacement (TKR).MethodsWe prospectively collected pre-operative and 1-year post-operative OKS for 2392 patients undergoing a TKR. Patient satisfaction was categorically assessed, according to whether they were: very satisfied, satisfied, neutral, and unsatisfied. Receiver operating characteristic curve analysis was used to identify thresholds in the OKS score that identified each level of patient satisfaction.ResultsThe post-operative OKS was the most accurate predictor of the level of patient satisfaction (area under the curve = 0.86). Very satisfied patients had a threshold value in the post-operative OKS of ≥36, which decreased to ≥27 points for satisfied patients, and further still to ≤25 for unsatisfied patients.ConclusionThe threshold values, we have identified for the different levels of satisfaction using the post-operative OKS, which is the most accurate predictor, can be used to predict level of patient satisfaction and give quantification of the OKS.

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