I sprained my acl and mcl on the tramp during the summer and I have to say that shit hurt like a fucker I mean when it was straight out not to bad but when I bent it just a littler it hurt pretty badly. Ended up going to the hospital when it first happened because I thought I tore something and they gave me this big knee brace and it was fine after a few weeks. Takes a little getting used to when you start walking again though. But good luck to you dude, I couldnt even imagine actually tearing one.