Fig. 4

Radiological parameters used in the current study. D1 is the tibiofibular clear space (TFCS); D2 is the medial displacement of the talus (MDT) (a). Tibial articular surface angle (TAS), the angle between lines a and b; talar tilt angle (TT), the angle between lines b and c; tibiocrural angle (TC), the angle between lines a and e; tibial medial malleolar angle (TMM), the angle between lines a and d (b). Tibial lateral surface angle (TLS), the angle between lines a and f (c). The hindfoot alignment angle (HFA), the line between a and g (d)