Ankle sprains are a common injury in young and old adults. In young adults the ankle sprain usually occurs when they jump or step on another persons foot. An ankle sprain can be an inversion or eversion sprain. The most common type of ankle sprain is an inversion sprain to the anterior talo-fibular ligament. In older adults ankle sprains usually occur when a person is walking on uneven surfaces. Risk factors for ankle sprains include previous ankle sprains, poor balance, agility sports, ankle abnormalities and forefoot abnormalities.