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(a) Preoperative X-rays of (case E31) showing bilateral tricompartmental OA. (b) Intraoperative clinical photograph showing the Allegretto™ fixed-bearing UKA system (Zimmer Warsaw, IN, USA). (c) Postoperative X-rays anteroposterior and lateral views of both knees showing bilateral UKA. (d) X-rays anteroposterior views at 4 years followup showing no signs of wear, lysis, loosening or subsidence
