I tore my ACL & MCL playing no-pad tackle American football.
(Apparently, the zombies had already gotten my "brainnnnzzzz")
It was a freak accident- I was making a tackle on a guy a little smaller than myself (who was wearing someone else like a cape as he ran with the ball) and instead of the turf giving way, my knee did.
The pain of the injury was bad enough...but rehab was the killer. (My surgery used patellar material to rebuild my ligaments, FYI.)
I'll say this much, though. If you follow doc's orders, it will all work out fine.
However:
1) Stay ahead of the pain. I forgot to take my meds on schedule, missing by about 1.5 hours more than I should have. I was sitting down and sitting still, so I didn't notice anything. When I finally did move, the pain was excruciating. The 8', 1 leg + crutch walk to take my meds seemed like doing a marathon with nails in my foot. I never missed another dose time again.
2) Be prepared for your painkillers to do weird things to your perceptions. I was functionally illiterate for almost a year during my rehab. Every time I looked at the printed word at the size usually used in books or newspapers, it literally looked like the letters were hula-dancing on the page. Since I couldn't read books or papers, I wound up watching a lot of mindless TV.
3) Keep an eye on your blood pressure. That kind of pain & rehab can cause it to jump a bit.
4) After your physical recovery is complete, expect about another year of mental rehab. The whole year after my rehab, I was skittish while playing volleyball or bowling- my mind kept telling itself that the knee was about to give out. While technically completely recovered, the muscles around the joint weren't up to full pre-injury strength, so it felt just wobbly enough to erode my faith in it.
5) Wear shorts whenever able- chicks dig the scar & your story will get you ...sympathy...