Lateral radiograph showing the measurements used to determine the postoperative tibiotalar ratio (tibiotalar ratio = AB / AC x 100). The posterior talar point (point A) was defined as the intersection between the contours of the posterior subtalar articular surface and the posterosuperior calcaneal cortex, and the talar reference line was defined as the line through point A parallel to the floor. The anterior talar point (point C) was defined as the vertical projection of the most anterior aspect of the talus onto the talar reference line. Longitudinal talar length was defined as the length AC, and the distal tibial axis was defined as the longitudinal middisecting line of the distal tibial shaft determined at 5 and 10 cm above the ankle.