Background: In a prospective cohort study, we wanted to detect thresholds distinguishing between patients with\na satisfactory and an unsatisfactory outcome after total knee replacement (TKR) based on Patient-Reported\nOutcome Measures (PROMs), namely the Oxford Knee Score (OKS), using patient satisfaction and patient-perceived\nfunction as global transition items.\nMethods: Seventy-three TKR patients completed the OKS questionnaire before surgery and were invited to complete\nthe same questionnaire again 6 (4 to 9) months after surgery. Correlations between outcome measures and anchors\nwere calculated using Pearson�s correlation coefficient. Thresholds were established by receiver operating\ncharacteristics (ROC) analysis, using multiple anchor-based approaches.\nResults: Patients showed a mean increase of 16.5 (SD 9.5) in OKS following TKR. Significant positive correlations were\nfound between outcome measures and anchors. Six different thresholds were determined for outcome measures\ncoupled with satisfaction, patient-perceived function and a combination thereof using a cut-off of 50 and 70.\nConclusions: This study has established a set of clinically meaningful thresholds for Oxford Knee scores that may\nhelp to detect TKR patients who might be in need of post-operative evaluation
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