In my years coaching HS basketball, I've seen four kids go down with complete ACL tears that were non-contact and looked like nothing at all. One young lady even walked to the bench and said she thought she tweaked something. We sat her, of course, and it swelled up over half. Next day MRI came back with an ACL. Gino Auriemma, in his book, related that Sue Bird simply said, "Ouch," and kept on down the floor til she realized it wasn't good. ACL's are devastating, and they don't always look like much.Didn’t even look like anything nasty ..