Winter Olympics

I'll start off by saying I'm not really that interested in them.
What did get my interest was that Lindsey Vonn ruptured her ACL a few days ago and is back in training to try to be able to compete in her event in a few days time.
When football and basketball players have an ACL injury, they are usually out for a year before they start competing again.
How is she able to ski down a mountain, at 85 mph, making sharp turns to the left and the right after only a few days since rupturing her ACL?

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