Sprains and strains, from twisted ankles to aching backs, are among the most common injuries. A sprain is a stretching or tearing of ligaments, the tough, fibrous bands of tissue that connect bones to one another at a joint. A strain is a stretching or tearing of muscle tissue, commonly called a pulled muscle.
Given adequate time and rest, most sprained joints or strained muscles will heal themselves. But severe tearing or complete rupture of the affected tissues usually requires surgical repair. And damage caused by a sprain can leave the bones in the affected joint improperly aligned, or the ligaments so stretched and weakened that the joint is particularly vulnerable to future injury.
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