An ankle sprain is an injury that causes a stretch or tear of one or more ligaments in the ankle joint. Ligaments are strong bands of tissue that connect bones at the joint. Sprains may be graded as I, II, or III depending on their severity:
Grade I Sprain: Pain with minimal damage to the ligaments
Grade II Sprain: More ligament damage and mild looseness of the joint
Grade III Sprain: Complete tearing of the ligament and the joint is very loose or unstable
Sometimes sprains are just classified as mild or sever, depending on the amount of ligament damage. Most sprains occur in the outside part of the ankle, but they can occur on the inside.
An ankle sprain is caused by twisting your ankle. Your foot usually turns in or under but may also turn to the outside.
Symptoms of a sprained ankle include:
Your doctor will review how the injury occurred and consider your symptoms. An x-ray will be taken and a physical exam will be performed.
Information obtained from The Sports Medicine Patient Advisor by Pierre Rouzier, MD