The talus bone (/ˈteɪləs/ ; Latin for ankle), astragalus /əˈstraeɡələs/ , əˈstræɡələs or ankle bone is one of the group of foot bones known as the. Tarsus the tarsus forms the lower part of the ankle joint through its articulations with the lateral and medial malleoli of the two bones of the lower, leg the tibia and. fibulahe talus bone of the ankle joint connects the leg to the foot. The head of talus looks forward and medialward; its anterior articular or navicular surface is large, oval, and convex.