Fig. 1From: Robotic device-assisted knee extension training during the early postoperative period after opening wedge high tibial osteotomy: a case reportFrontal 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 radiographBack to article page