Fig. 4

The central image of the sagittal tibial MRI is identified, highlighting the attachment point of the posterior cruciate ligament, the intercondylar eminence, and the plane that delineates the anterior and posterior cortex of the proximal tibia (A). Software is utilized to draw two circles within the image: the first circle should touch the proximal end of the tibia and the anterior and posterior cortex, while the second circle, positioned below the first, should also be tangent to the anterior and posterior tibia. The centers of the circles should align, establishing the anatomical axes of the tibia. To determine the posterior inclination of the medial tibial plateau, locate the central slice of the medial tibia on a sagittal T1-weighted knee MRI. Connect the most anterior and posterior points of the medial tibial platform with a straight line, and calculate the angle between the anatomical axis of the tibia and the tangent to the medial tibial plateau, subtracting 90°(B)