Fig. 4
From: An anthropometric study of distal tibiofibular syndesmosis (DTS) in a Chinese population
Calculation of the posterior and extra-posterior indices in the relatively posterior fibula. a The backward length is the distance from line G to line F (bl) and the forward length is the distance from line E to line D (fl). The posterior index was calculated as backward length divided by forward length (bl/fl). b The extra-posterior index was defined as the negative value of backward length (−bl) when the posterior border of the fibula across anterior colliculi of the tibia divided by forward length (−bl/fl)