An ankle sprain refers to tearing of the ligaments of the ankle. The most common ankle sprain occurs due to an inversion injury, which means the foot rolls underneath the ankle or leg (twisted ankle). It commonly occurs during sports activities. Patients will complain of pain on the outside of their ankle and various degrees of swelling and bleeding under the skin (i.e. bruising). Depending on the severity of the sprain, a person may or may not be able to put weight on the foot and my require an external support (orthotic or Ace bandage).