Replying to SERIOUS KNEE PROBLEM? NEED ANSWERS!!!

ok-basically i got hit in a football game (not on my knee-my chest) and my foot planted into the ground but my knee went with my body. my left knee twisted inwards and i felt it pop-almost like it feels when youre double jointed(but im not!)and when it popped, it shot like under my knee cap or something.

i played on it the rest of the game, but i couldnt straighten it out at all...its been 1 whole day and i cant put any pressure on it at all, bend it up or down, and its frozen in like a half cocked position.

does anybody know if im gonna be out for a while, or even all season, and worst ski season? and help would be greatly appreciated.