I don't think there is any real protection against an ACL other than a thick unwieldy brace. If there was one, the inventor would be having coffee with Warren Buffet. My daughter, who played basketball and lacrosse in college, has had 3 of them, two in college and once in a post graduate league. I took her to anti - ACL training camp when she was in grammar school and beyond. It didn't help. Twice another player fell on her and once it was a recurrent tear due to a non-contact pivot type of injury. It's the bane of female athletes.