Fig. 3

Magnetic resonance images depicting the method used to obtain the sagittal slopes of the medial and lateral tibial plateaus. a This shows the transverse plane passing through the tibiofemoral joint and showing the dorsal aspect of the tibial plateau. Lines A and C show the corresponding locations of the sagittal planes in the medial and lateral tibial plateaus. Line B in the same figure shows the approximate location of the sagittal plane that was used to determine the orientation of the longitudinal axis. b The longitudinal axis (line L) of the tibia was obtained by determining the midpoint of the anterior and posterior widths of the tibia at two points located as distally in the image as possible (locations 1 and 2). c The medial tibial slope was the angle between a line joining the peak points on the medial plateau (points A and B) and line P perpendicular to line L. d The lateral tibial slope was the angle between a line joining the peak points on the lateral plateau (points A and B) and line P perpendicular to line L