A case of recurrent hemarthrosis of the knee after a mobile-bearing unicompartmental knee arthroplasty (UKA;\r\nOxford UKA) is described. A 58-year-old man met with a road traffic accident 10 months after UKA. He developed\r\nanteromedial pain and hemarthrosis of the knee joint 1 month after the accident, which required multiple\r\naspirations. Physical examination showed no instability. Plain radiograph revealed no signs of loosening. All\r\nlaboratory data, including bleeding and coagulation times, were within normal limits. Diagnostic arthroscopy\r\ndemonstrated loosening of the femoral component. Any intraarticular pathology other than nonspecific synovitis\r\nwas ruled out. The loose femoral component and polyethylene meniscal bearing were revised. Since then,\r\nhemarthrosis has not recurred.
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