Figure 1. A: anterior distal tibial angle, between the anatomical axis of the tibia in the posteroanterior plane and the line of the distal joint surface of the tibia; B: talar tilt angle, formed between the line of the tibial joint surface and the line of the talar joint surface. Assesses joint congruency; C: lateral distal tibial angle, between the lateral anatomical axis of the tibia and the line of the lateral distal joint surface of the tibia.