The ankle is made up of 3 bones which are connected by muscles, ligaments and tendons. The tibia is the large bone located on the inside of the shin. The fibula is the thinner bone on the outside of the shin. The ends of the tibia and fibula are joined together by a strong ligament to form a socket called the ankle mortis. The talus is the highest placed bone of the foot. It has a dome which fits inside the ankle mortis (socket). Together these 3 bones form the ankle joint.
Articular cartilage is the smooth shiny material present anywhere that two bony surfaces come into contact with each other. In the ankle articular cartilage covers the end of the tibia, the dome of the talus and the bottom part of the fibula. Articular cartilage allows the ankle bones to move easily as the ankle bends up or down. The ligaments around the ankle joint are like strong ropes that help connect bones and provide stability to joint. In the ankle there are 3 ligaments on the outside of the ankle and one broad ligament on the inside aspect of the ankle. It is most common for people to injure the ligaments on the outside of the ankle.