Terry Collins admitted on Tuesday that overuse played a role in reliever Tim Byrdak's shoulder injury. Byrdak has a torn anterior capsule in his left shoulder. Byrdak leads baseball with 56 appearances this year and has pitched in 128 games over the past two seasons. "I don't think there's any question (usage may have caused injury). Injuries are caused by overuse. And doctors have told me that when they're going to break, they're going to break. There's not much you can really do about it," Collins said. "And Tim's been the one guy who has taken great care of himself, takes great care of his arm, doesn't overthrow. Even pregame stuff, he tenders the amount of throwing he does before a game. "It's just the fact that he was in that role that he was where he had to go out there a lot. There's no question we probably used him more than we should have. But we also wouldn't be here without him."