It's weird, this happened to a friend of mine just about a year ago. He was stepping off his truck and WHAM! He's a farmer (and a machinist), and when I saw him several days later he was like, Yeah, mah kneecap split in two and most of it just jumped to the outside of my leg. . . Eventually he told me that every so often he'd be watching TV or something and it would dislocate and he'd be in a new world of pain. Initially his surgery was scheduled like 1-2 months out, but when he say the surgeon who was actually doing the surgery, he was given emergency status and it was done within a week. He missed three months of work.
He never owned up to being kicked by a cow or anything, but I still wonder how his kneecap split like that. A year out he seem
Edited to add: FF, it was Pulido, dunno if she's gotten in. I really think she'd make a great doc -- medical school isn't unlike UConn basketball. It's a lot of work, grueling, and every so often you think you've gotten something and you realize maybe not.