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. 2017 Aug 5;11:213. doi: 10.1186/s13256-017-1367-3

Fig. 1.

Fig. 1

Frontal images of the knee joint in a 67-year-old woman who underwent opening wedge high tibial osteotomy for osteonecrosis of the knee. a The lesion area visualized by preoperative magnetic resonance imaging is shown with an arrow. b Postoperative radiograph