i injured my knee playing basketball and at the time i heard a pop but no extreme pain and no swelling, now my knee feels very weak and gives way alot and i have bruising on both sides of my left knee. i went to a appointment and the doc did the lachman test i think it is and told me my knee had a mild sprain but i think it is much more, my knee hurts all day and the anti inflamitories they gave me does not help, what could be the problem