Figure 3. A: left ankle, seen from an posterior perspective. Number 1 refers to the anterolateral portal, and number 2 refers to the anteromedial portal; B: left ankle, seen from an lateral perspective. Number 1 refers to the anterolateral portal. With the foot in neutral position (90 °), a straight line (blue), parallel to the sole of the foot, is drawn from the inferior pole of the lateral malleolus to the medial side. The planned posterolateral and posteromedial portals are located along this line, 5 mm anterior to the lateral and medial border of the Achilles tendon (ML, lateral malleolus; MM medial malleolus; AT, Achilles tendon).