Fig. 4From: Robotic device-assisted knee extension training during the early postoperative period after opening wedge high tibial osteotomy: a case reportTibial slope angle and Insall-Salvati ratio. These indicators were measured on the lateral radiograph of the knee joint. a Before surgery. b After nail extraction at 1 year after opening wedge high tibial osteotomy. α Tibial slope angle, b/a Insall-Salvati ratioBack to article page