A rare case of bilateral large osteolysis following cemented and cementless total knee arthroplasties

Open Access This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the source is credited. DOI 10.3109/17453674.2013.752693 A 66-year old woman (BMI 36) presented for routine followup after undergoing total knee arthroplasty (TKA) in the right knee 12 years ago, and TKA in the left knee 4 years ago. The right TKA was a cementless cruciate-retaining prosthesis (Encore Medical Foundation Knee, femoral component porous coated CoCrMb alloy, tibial component Ti-alloy with 4 screws, PE insert 9 mm). The left TKA was a cemented cruciate-retaining prosthesis (Zimmer Natural Knee II, femoral component CoCrMb alloy, tibial baseplate component Tialloy, PE insert 9 mm). The patient reported only mild problems (knee score 88 points, function score 60 points). Radiographs and CT scans revealed extensive osteolysis at the proximal medial tibia of both knees (Figures 1 and 2). There was a mild varus malalignment (4°) of both legs. Rota-