From someone who has had 2 torn ACL and a torn MCL, I can tell you from experience that it just happens. Especially in a situation where there were no warning signs of a knee problem. I was 16 and playing in a summer basketball league and I was going up for a block and someone purposely undercut me. I landed straight down on both legs. Both knees shredded. And this was 34 years ago, so any chance of playing again for varsity high school was over. But it wasnt some physio's fault, and there were no preexisting complications.
It just happened.
It just happened.
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