To sprain one of your joints is to twist it suddenly. The result is a sprain, in which the ligaments have been injured. Don’t go hiking in high heels because you might sprain your ankle.
A sprain — which occurs at joints such as the wrist, elbow, or knee — happens when the ligaments are turned quickly and painfully. After the initial pain, a sprain will swell up. Spraining something is difficult, but things could be worse — a sprained knee will heal quicker than a broken bone.