An ankle sprain occurs when the ligaments that support your ankle stretch beyond their normal range or tear. Ligaments are tough bands of tissue that connect bones and provide stability to joints. The ankle is particularly vulnerable to sprains because it bears your body weight while allowing complex movements. If not properly managed, ankle sprains may contribute to ankle instability or recurring issues in some cases.
Lateral ankle sprains affect the ligaments on the outer side of your ankle. These occur when your foot rolls inward (inversion), stretching or tearing the lateral ligaments. The anterior talofibular ligament (ATFL) is most commonly affected, followed by the calcaneofibular ligament (CFL).