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All it takes is a simple misstep, and suddenly you have a sprained ankle. An ankle sprain is one of the most common musculoskeletal injuries in people of all ages, athletes and couch potatoes alike. The injury occurs when one or more of the ligaments in the ankle are stretched or torn, causing pain, swelling, and difficulty walking. Many people try to tough out ankle injuries and don't seek medical attention. But if an ankle sprain causes more than slight pain and swelling, it's important to see a clinician. Without proper treatment and rehabilitation, a severely injured ankle may not heal well and could lose its range of motion and stability, resulting in recurrent sprains and more downtime in the future.

Anatomy of an ankle sprain

The most common type of ankle sprain is an inversion injury, or lateral ankle sprain. The foot rolls inward, damaging the ligaments of the outer ankle — the anterior talofibular ligament, the calcaneofibular ligament, and the posterior talofibular ligament. (Ligaments are bands of fibrous tissue that connect one bone to another; see illustration.)

Less common are sprains affecting the ligaments of the inner ankle (medial ankle sprains) and syndesmotic sprains, which injure the tibiofibular ligaments — the ligaments that join the two leg bones (the tibia and the fibula) just above the ankle. Syndesmotic sprains, which occur most often in contact sports, are especially likely to cause chronic ankle instability and subsequent sprains.

The severity of an ankle sprain depends on how much damage it does and how unstable the joint becomes as a result. The more severe the sprain, the longer the recovery (see "Grades of ankle sprain severity").

How to treat a sprained ankle

The first goal is to decrease pain and swelling and protect the ligaments from further injury. This usually means adopting the classic RICE regimen — rest, ice, compression, and elevation. If you have severe pain and swelling, rest your ankle as much as possible for the first 24 to 48 hours. During that time, immerse your foot and ankle in cold water, or apply an ice pack (be sure to cover the ankle with a towel to protect the skin) for 15 to 20 minutes three times a day, or until the swelling starts to subside.

To reduce swelling, compress the ankle with an elasticized wrap, such as an ACE bandage or elastic ankle sleeve. When seated, elevate your ankle as high as you comfortably can — to the height of your hip, if possible. In the first 24 hours, avoid anything that might increase swelling, such as hot showers, hot packs, or heat rubs.

When to see your doctor

Unless your symptoms are mild or improving soon after the injury, contact your clinician. He or she may want to see you immediately if your pain and swelling are severe, or if the ankle feels numb or if you can't bear weight. He or she will examine the ankle and foot and may manipulate them in various ways to determine the type of sprain and the extent of injury. This examination may be delayed for a few days until swelling and pain improve; in the meantime, continue with the RICE regimen.

X-rays aren't routinely used to evaluate ankle injuries. Ligament problems are the source of most ankle pain, and ligaments don't show up on regular x-rays. To screen for fracture, clinicians often use a set of rules — called the Ottawa ankle rules, after the Canadian team that developed them — to identify areas of the foot where pain, tenderness, and inability to bear weight suggest a fracture. A review of studies involving more than 15,000 patients concluded that the Ottawa rules identified patients with ankle fractures more than 95% of the time.

How to strengthen your ankle after a sprain

To recover from an ankle sprain fully, you'll need to restore the normal range of motion to your ankle joint and strengthen its ligaments and supporting muscles. Studies have shown that people return to their normal activities sooner when their treatment emphasizes restoring ankle function — often with the aid of splints, braces, taping, or elastic bandages — rather than immobilization (such as use of a plaster cast). Called functional treatment, this strategy usually involves three phases: the RICE regimen in the first 24 to 48 hours to reduce pain, swelling, and risk of further injury; range-of-motion and ankle strengthening exercises within 48 to 72 hours; and training to improve endurance and balance once recovery is well under way.

Generally, you can begin range-of-motion and stretching exercises within the first 48 hours and should continue until you're as free of pain as you were before your sprain. Start to exercise seated on a chair or on the floor. As your sprained ankle improves, you can progress to standing exercises. If your symptoms aren't better in two to four weeks, you may need to see a physical therapist or other specialist.