The injury occurred partway through the second period when Hedman appeared to injure his left knee in a collision with Flames forward Garnet Hathaway. Hedman was then seen being helped to the Lightning locker room.
Hedman, who was named to his second all-star game earlier this week, is third in defence scoring with 33 points. His plus-24 rating leads all defencemen and 25:56 average ice time per game is sixth among all players.
You can watch a video of Hedman’s injury at the top of this page.