The lateral distal tibial angle is measured as the angle between the long axis of the tibia and the articular surface of the tibial plafond (red line); the tibial length is measured from the plateau to the plafond, the fibula length is measured from the apex of the fibular head to the distal tip of the lateral malleolus (yellow line). The fibula/tibia length ratio is calculated by dividing the fibula length by the tibia length. We use a rectangle to enclose all exostoses around the proximal fibula and measure the length of the rectangular transverse axis. The fibular neck/physis width ratio = A/B.