Fig. 2

Reference points of the implant-based axis. a: Multi-planar sagittal reconstruction image of the femoral component. The mediolateral center at the distal end of the anterior chamfer was defined as the center of the femoral component. b: Multi-planar reconstruction axial image of the tibial tray. A perpendicular bisector of a line segment connecting the anterior end of the dovetails (black dots) and the center of the anteroposterior edges of the tibial tray (white triangles) was defined as the center of the tibial tray (white dot)