Ankle sprains are a familiar term to most people and involve damage to one or more of the many ligaments around the ankle.
An inversion sprain (when you go over on the outside of the ankle) can cause damage to not only the ligaments but to the local muscles and the tibio-fibula joint.
This sometimes results in a fracture or damage to one of the tendons on the outside of the ankle. In addition, this can cause compression of the bones on the inside of the ankle.
Ankle injuries can be very stubborn to treat and in some cases can continue for a number of years if not initially treated at the time of injury and rehabilitated for long enough or a patient thinking they can return to normal activity without having allowed the ankle enough time for healing.