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Ankle Sprain – Sprained Ankle


Ligaments are fibrous, elastic bands of tissue that connect and stabilize the bones. An ankle sprain is a common, painful injury that occurs when one or more of the ankle ligaments is stretched beyond the normal range of motion. Sprains can occur as a result of sudden twisting, turning or rolling movements.


Ankle Sprain – Sprained Ankle

Causes & Triggers

Lateral Inversion Sprains
Ankle sprains are categorized by the type of motion that causes the injury. The most common type, called a lateral inversion sprain, occurs when the foot rolls inward. This causes injury to the ligaments on the outer side of the ankle, especially the anterior talofibular ligament.

Medial Eversion Sprains
A second type of sprain, called a medial eversion sprain, occurs when the foot rolls outward. This type of sprain causes injury to the ligaments on the inner side of the ankle.

Syndesmosis (High Ankle) Sprains
The least common type of sprain is called a syndesmosis (or “high ankle”) sprain. This type of sprain occurs when the foot rolls outward and the leg turns inward.

  • Accident
  • Sports
  • Stretched or torn ligaments
  • Twisting, turning, rolling the foot
  • Uneven surfaces

Signs & Symptoms

Symptoms of an ankle sprain vary depend on the degree of ligament damage. Sprains are ranked in three degrees. A first degree sprain is a slight stretching of one or more ligaments. This results in mild tenderness. A second degree sprain is a partial tearing that results in moderate tenderness and swelling. The ankle may have some instability. A third degree sprain, the most severe, is a complete ligament tear. This results in severe pain, swelling and ankle instability.

  • Discoloration (black-and-blue)
  • Pain
  • Swelling

Tips & Treatment

Treatment for an ankle sprain depends on the severity of the injury. Treatment usually begins with rest, ice, compression and elevation. A first degree sprain typically requires a bandage wrap. A second degree sprain may require an ankle brace. A third degree sprain may require a cast or walking boot. As the ankle heals, all patients typically benefit from rehabilitation exercises. Surgery is not usually needed.

  • Ankle sprains are very common.
  • Severity of ankle sprains are graded as follows:
    • Mild—Grade I: Light damage to ligament fibers; improves with prescribed stretching
    • Moderate—Grade II: Partially torn ligament; ankle feels “loose”; may require splinting or casting
    • Severe—Grade III: Fully torn ligament; ankle feels highly unstable; often requires surgical repair

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