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A sprained ankle, also known as an ankle sprain, twisted ankle, rolled ankle, floppy ankle, ankle injury or ankle ligament injury, is a common medical condition where one or more of the ligaments of the ankle is torn or partially torn. ==Signs and symptoms== Knowing the symptoms that can be experienced with a sprain is important in determining that the injury is not really a break in the bone. When a sprain occurs, blood vessels will leak fluid into the tissue that surrounds the joint. White blood cells responsible for inflammation migrate to the area, and blood flow increases as well.〔(Ankle Sprains Symptoms -eMedicineHealth.com ), Retrieved on 2010-01-22.〕 Along with this inflammation, swelling from the fluid and pain is experienced. The nerves in the area become more sensitive when the injury is suffered, so pain is felt as throbbing and will worsen if there is pressure placed on the area. Warmth and redness are also seen as blood flow is increased. Also present is a decreased ability to move the joint, and difficulty using the affected leg. Image:Freshspraininbrace.JPG|Right foot, housed in an air brace, has become swollen as a result of a more severe 2nd degree sprain to the ankle. Image:Sprained foot.jpg|Right foot. A light 2nd degree sprain, two days after injury. File:Schwellung am Fußknloechel und Blutergussl.jpg|Right foot, 3rd degree sprain. One day after injury. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「sprained ankle」の詳細全文を読む スポンサード リンク
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