Genicular Artery Embolization for Recurrent Hemarthrosis of the Knee Following Total Knee Arthroplasty: A Single Centre Experience.

PURPOSE: To retrospectively review the safety and efficacy of genicular artery embolization procedures performed at our institution in patients presenting with recurrent knee hemarthrosis following total knee arthroplasty (TKA). MATERIALS AND METHODS: A total of 13 consecutive patients (average age: 68; range 51-84, 62% female) were identified who underwent 14 genicular artery embolization procedures after presenting with recurrent hemarthrosis after TKA. Patient charts were retrospectively reviewed for demographic information, pre-embolization investigations, and details of embolization procedure including complications, technical success, and clinical success. Each patient had failed initial conservative therapy and all patients had a diagnostic aspiration performed by the referring physician prior to the procedure. The average time between TKA and embolization in our cohort was 21 months. RESULTS: All procedures performed were technically successful, defined as elimination of periprosthetic hypervascular blush. An average of 3.6 genicular vessels were embolized in each patient; 355 to 500 microm polyvinyl alcohol (PVA) particles were used in each case. There were no cases of transient cutaneous ischemia, skin erythema, or skin necrosis. Clinical success was obtained in 85.7% of cases, defined by elimination of the presenting clinical symptoms (knee pain and swelling) during continued follow-up by the referring clinician. CONCLUSION: Particle embolization is a safe and effective treatment for recurrent hemarthrosis after arthroplasty and our experience suggests that utilizing particle sizes of greater than 300 microm appears to be important in order to avoid cutaneous ischemic complications.