If your child's ankle gives way more and more easily during sports, and, eventually, during everyday activities, he has developed chronic ankle instability. Often times, such instability is the result of an ankle sprain that has not been allowed to fully heal. Repeated ankle sprains cause a loss of proprioception (communication between the central nervous system and the muscles, tendons, and ligaments of the ankle), which, in turn can lead to faulty technique or a sudden loss of control or balance, either of which can, in turn, lead to even more sprains! If your child has a chronically unstable ankle, sports medicine experts say that a rehabilitation program supervised by a physical therapist or athletic trainer (ATC) is absolutely essential.