Replying to Dr. NS: knee injury

So during my lax game last night i got pushed from behind and fell in a funny way. my left leg came across my body, much like in a way you would see sitting with their ankle perched across their knee, reading the morning paper (pictures can be added if this is confusing). Anyway i fell on my leg like this and now it hurts to lock my leg, straighten it, do most things on it. Is this a hyperextension or what? is it okay to run or ski on? im have another game today, and then i plan on skiing tomorrow but should these things be cancelled? herp me out por favor :)