If an injury prevents you from playing at the required level or if playing through it increases the risk of making it worse, you should take a break. The "tough guy, gutting it out " meme is so tired and cliche. The sports world is filled with macho idiots who put themselves at further risk and weaken their teams by trying to maintain an image, one that at the end of the day is a self centered one, not one that is about the team. Brett Favre could possibly be the poster boy for this attitude, the guy was all about himself, lol.