I learned what an ACL ligament is. Basically, it's the ligament that holds your patella onto the front of your leg. If you rip it completely, like, say, in a fall off a desk at school, there're really nothing there but skin and blue jeans to keep your knee cap from popping off and rolling down the hallway, only to be used by a coterie of pestiferous 9th graders as a hockey puck, with Mr Millweed's door as the goal.
Most of this stuff about the rolling knee cap is just conjecture on my part. The thing about the ACL is all too painfully real.
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