Fig. 5

Schematic diagram showing the WB line passing point, tibial position, and femoral position. Regarding WB line passing point, WB line was defined as the line connecting the femoral head with the center of the ankle joint in a 3D space. WB line passing point was the location of the WB line on the xy plane in the tibial coordinate system. The WB line in the tibial coordinate system was described by percent indication (0% = origin in the tibial coordinate system, + 100% = medial-most point in MCT, and ≥ 100% = passing point outside from MCT). The tibial position was defined as the angle between the WB line and the x-axis in the tibial coordinate system. The femoral position was defined as the angle between the WB line and the surgical epicondylar axis in the tibial coordinate system