During her final season with the Gophers, there were weeks late in the season where Amanda Kessel had problems just gripping her stick due to a wrist injury. She sat out one series, barely got off the bench in the WCHA quarter, but returned for the Final Face-Off. OSU's coach took great pride in holding her without a point in the semifinal, the first game all season where she didn't have a point. Had they known Kessel likely couldn't shoot the puck, maybe they pay less attention to her and her linemates don't wind up scoring three goals.
I always figure that other teams may or may not know the exact injury that players are dealing with, but they certainly don't need to find out about it from me.