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Sidney Crosby and Mikael Samuelsson fight for a loose puck during Game 6 of the 2008 Stanley Cup Finals. Crosby is just one of 22 NHL players currently sidelined by head injury, writes SI.com’s Stu Hackel. (David E. Klutho/SI)
HACKEL: The NHL’s worst nightmare coming true as head injuries increaseVIDEO: Explaining Crosby’s symptoms | How Pens should manage CrosbyPHOTO GALLERY: Notable hockey careers cut short by concussion

Sidney Crosby and Mikael Samuelsson fight for a loose puck during Game 6 of the 2008 Stanley Cup Finals. Crosby is just one of 22 NHL players currently sidelined by head injury, writes SI.com’s Stu Hackel. (David E. Klutho/SI)

HACKEL: The NHL’s worst nightmare coming true as head injuries increase
VIDEO: Explaining Crosby’s symptoms | How Pens should manage Crosby
PHOTO GALLERY: Notable hockey careers cut short by concussion