Ankle bone, also known as the talus bone, is an essential element in the structure of the ankle joint. This bone is located in the lower leg, between the tibia and fibula bones and the heel bone. Talus bone is the most commonly used synonym for ankle bone, but there are other terms referring to this bone as well. Some of the other synonyms that can be used for ankle bone are the astragalus bone, the talus, and the ankle joint bone. No matter which term is used to refer to it, the importance of the ankle bone to maintaining the integrity of the ankle joint cannot be overstated.