Grade I sprains are the mildest. The ligaments have been stretched and you may feel some soreness and swelling. These tend heal on their own within a few days to a couple of weeks. Grade 1 sprains are usually treated using the rest, ice, compression, and elevating the leg.
Grade 2 sprains are when the ligaments tear a little. Your ankle joint may feel wobbly or loose. These sprains cause more pain and swelling, and sometimes bruising. You may need to wear a splint or cast.
Grade 3 sprains are when the ligament tears completely. Your ankle joint will be very painful and unstable and you may not be able to put any weight on it. A Grade 3 sprain can lead to permanent ankle disability if not treated. You should see a doctor as soon as possible. Surgery is only usually indicated if conservative measures fail for several months.

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