A, Arthroscopic subtalar arthrodesis. Locations of sural nerve, peroneal tendons, and posteromedial neurovascular bundle are marked. Portals are shown with patient in lateral position. A, Accessory sinus tarsi portal; B, anterolateral portal; C, posterolateral portal. B, Arthroscopic subtalar arthrodesis with patient prone. A, Posteromedial portal; B, accessory lateral portal. SEE TECHNIQUE 85.7.