i dont think its ur ACL, a teacher at my school ripped both of his about 1 year a part and hes a huge huge guy, he was cryin glike a lil school girl, i broke my knee cap into 4 pices 2 times, once when i was ike 6, i got hit by a car on my bike and spent about 6 months in a cast and had a surgery, second time like 3 months after i got the cast off i got a brick thrown at me and broke it again in the same exact place, and then a nother 6 months with that damn cast, it sucks i still have to get 2 more surgerys to replace some cartiliedge (i duno how to spell it) knees suck
