FILE - In this Nov. 21, 2011, file photo, Pittsburgh Penguins captain Sidney Crosby speaks to reporters after a game-day morning skate before his NHL hockey return against the New York Islanders in Pittsburgh. Crosby missed ice time from Jan. 5 until Nov. 21 after hits to the head in consecutive games led to a concussion. Crosby has been out since Dec. 5 and is now back on the injured list because of a recurrence of concussion-like symptoms. Hard hits leading to concussions have contributed to the NHL's struggles in balancing its fast, physical nature with growing evidence that aggressive play can cause long-lasting damage. (AP Photo/Gene J. Puskar, File)
Penguins' Sidney Crosby
Pittsburgh Penguins' Sidney Crosby in action on the ice, who one year ago was out for the season due to a concussion.