hi i am a 17 year old footbal player. About 2 years ago i had a small injury in my knee. Back then it was so small I dont even remember what happend. But over the years i have noticed that my left knee is different than my right. They both look alike, but if I sit and exend my left knee it moves up then right before it locks out i have to move my knee to the left and then it will lock out. Also just recently i noticed when i sprint my knee hurts. When i wrapped an ace bandage around my knee it help a little. If anyone can tell me what i have and if there are any braces that will help me.