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The ankle is a large joint made up of three bones: The shin bone (tibia) The thinner bone running next to the shin bone (fibula) A foot bone that sits above the heel bone (talus) The bony bumps (or protrusions) seen and felt on the ankle have their own names: The medial malleolus, felt on the inside of your ankle is part of the tibia's base The posterior malleolus, felt on the back of your ankle is also part of the tibia's base The lateral malleolus, felt on the outside of your ankle is the low end of the fibula The ankle joint allows up-and-down movement of the foot, the tarsal bones form a gliding joint. The subtalar joint sits below the ankle joint, and allows side-to-side motion of the foot. Numerous ligaments (made of tough, moveable tissue) surround the true ankle and subtalar joints, binding the bones of the leg to each other and to those of the foot. COMMON DISORDERS Sprained ankle: Damage to one of the ligaments in the ankle. High ankle sprain: The ligament joining the two bones of the lower leg (tibia and fibula), called the syndesmotic ligament, is injured. A high ankle sprain causes pain and swelling similar to a true ankle sprain, but can take longer to heal. Ankle fracture: A break in any of the three bones in the ankle. Most commonly, the bones of the lower leg (tibia or fibula) is fractured. Ankle arthritis:osteoarthritis, the most common form of arthritis. Rheumatoid arthritis: An autoimmune form of arthritis in which the body attacks joint tissue, causing inflammation, pain, and swelling. Gout: A form of arthritis in which crystals periodically deposit in joints, causing severe pain and swelling. Psoriatic arthritis: This form of arthritis, which causes swelling and pain, is associated with the skin condition psoriasis. Septic arthritis: Caused by bacterial infections that may occur in the ankle, this form of arthritis develops quickly, causing severe pain, swelling, fever, and difficulty moving the ankle. http://www.webmd.com/fitness-exercise/picture-of-the-ankle