What does "leg hitch" mean in The Twilight Saga: Eclipse?

I've read the books and all but when I go to blog sites they are ALL talking about this so called "Leg Hitch" that happens in the book! I am like did I miss somthing here?? So please help me!! I would strongly appreciate it!
Update: I'm sorry but i've read the books 4 times each know and I don't ever re-call Bella's leg falling off! I'm not being rude!
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