Ok i got pinned between 2 vans 2 months ago i went to an ortho he said its nothing but a muscle bruise but.. since the accident my knee will just snap back suddenly and its very painful.. down my calf to my ankle and up through my hip and for atleast 20 minutes i cant bare weight on it i have to sit.. and tonight after is snapped back it felt hot to the touch.. i checked my other knee its not just regular body temp.. and my knee is swollen kinda looks like a orange almost a grape fruit. What could be wrong? the mri came up clean i guess thats what the dr said but this worries me and it just plain hurts