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ciency after 3 years. Concerns exist regarding the analgesia effect and safety of multiple versus single doses dexamethasone in unicompartmental knee arthroplasty. There is an urgent need of studies that efficiently control for confounding, conduct comprehensive and consecutive observation of potential risks of the dexamethasone administration, and investigate its clinical applicability. We thus further designed a randomized controlled study to assess the different dose of dexamethasone on postoperative pain and complications in