A stretching or tearing of ligaments, the fibrous bands that bind bones together at a joint, is referred to as a sprain. Typically, the surrounding blood vessels are also injured, resulting in bruising.
Although ligaments are very strong, almost any fall or misstep that twists a joint into an unnatural position can result in a sprain; in fact, a sprained ankle is the most common of all sports injuries. The knees are also vulnerable to severe sprains.
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