most do it because they had a previous knee injury (mainly acls). Grubb had a neoprene thing on, but that really just keeps your knee warm and doesn't support it...I don't know why he wears it. I don't know of any pros that wear one of the expensive knee braces "just for protection" so to speak (meaning without any previous injury). Interestingly enough,watson tore his acl twice (I think it was the same one) and his knee is strong enough to where he doesn't wear a brace anymore. Anyway, I hope that helps.
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