Abstract
Introduction: Pigmented villonodular synovitis (PVNS) after replacement arthroplasty is a potential cause of postoperative pain and hemarthrosis. The disease is difficult to diagnose after arthroplasty, since magnetic resonance imaging (MRI) appearances are subject to metal artifact making them less than ideal. Case Report: A case of a 61yearold woman with PVNS after unicompartmental knee arthroplasty (UKA). She was treated with an arthroscopic synovectomy with good result. Conclusion: MRI evaluation of the residual side of the knee joint after UKA is valuable for the differential diagnosis of PVNS.
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