Abstract
Ankle sprains are the most common injury in sports related activity. A negative consequence of approximately 40% of lateral ankle sprains is the development of CAI. CAI is the development of repetitive ankle sprains and persistent symptoms after injury. Research over the past 40 years has unsuccessfully tried to elucidate the causes of CAI. Recent evidence has suggested mechanical instability of the ankle may lead to the development of CAI, which may be present as a result of incomplete healing of the ligaments of the ankle.