Illustration of the transversal plane of computer tomography 10 mm above the plafond (black contours) and the plane at the level of the tibiofibular stabilization (white contours). L1 (black dashed line) = perpendicular line crossing the midpoint between the anterior tubercle and posterior tubercle of the tibial incisura; L2 (white dotted line) = tangent along the axis of the fixation device; TP transversal plane; angle between L1 and TP = Incisura Angel (IA); angle between L2 and TP = Device Angel (DA)