Clement ND, Afzal I, Demetriou C, et al. - This research was undertaken to investigate if the postoperative Oxford Knee Score (OKS) demonstrated a ceiling effect at one and/or two years after total knee arthroplasty (TKA) and preoperative independent predictors were distinguished for patients that achieved a ceiling score after TKA. Researchers performed a retrospective cohort including a total of 5,857 patients undergoing a primary TKA from an established arthroplasty database. They applied logistic regression analysis to distinguish independent preoperative predictors of patients achieving postoperative ceiling scores. The applied receiver operating characteristic curve to distinguish a preoperative OKS that prognosticated a postoperative ceiling score. The postoperative OKS indicated a small ceiling impact when characterized by a maximal score, but when characterized by a postoperative OKS of 44 or more the ceiling effect was moderate and failed to meet standards. The preoperative OKS was found to be an independent predictor of achieving a ceiling score.