Fig. 2From: A risk assessment model for chronic ankle instability: indications for early surgical treatment? An observational prospective cohort – study protocolAlignment assessment using the medial distal tibial angle (b). This angle (arrows) is formed by the tibial axis (a-b) and the joint orientation line of the distal tibia (c). The MDTA was measured in two ways: (1) the absolute angle and whether this angle included a (2) varus (<87o), normal (87-91o) or valgus (>91o)Back to article page