Fig. 3.

Measurement method for the hindfoot alignment view. We defined the mid-diaphyseal axis of the tibia by bisecting the tibia into two mid-diaphyseal points (lines A and B) 30 mm apart and extending the line distally (line E). The mid-diaphyseal axis of the calcaneus is defined by a line through two points in the calcaneus. At a distance of 7 mm from the most distal part of the calcaneus, a horizontal line is drawn (line D). Line D is divided into a 40%:60% ratio, where the length of the 40% line is measured from the lateral side. A second line (line C) is drawn horizontally, 20 mm from the most distal part of the calcaneus. The calcaneus axis (line F) is drawn by connecting the 40% mark at line D and the bisected line C. The hindfoot angle (G) is the angle between lines E and F