Replying to Help me... What did i do to my knee?

Alright I was at bristol today and they made the jump bigger so i decided to throw some 7's n then one run i was goin n i guess iw as leanen back alot or something but i hurt my knee alot n then i was riden down and my knee just gave out it felt like it popped and i just collapsed. I can walk but it feels real week. Does anyone know what happend to me and when can i ski. I have a trip planned Next sat for a week. Any input will be nice thank you.