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Recurrent spontaneous haemarthrosis after knee arthroplasty occurs in less than 1% of cases, commonly thought to be the result of impingement of hypertrophic vascular synovium or fat pads, and exacerbated by anti‐coagulation or anti‐platelet therapy. Traditional treatment comprises an initial period of rest followed by open or arthroscopic washout, and by synovectomy if bleeding recurs or fails to...