According to Bergeron, he played through a broken rib and torn cartilage coming into Game 6. That's not at all, though. He also sustained a separated shoulder during the game, but did not come out.
The Stanley Cup Playoffs have seen many players fight through injuries, but this goes beyond the norm. Remember that Bergeron was taken to a Chicago hospital by ambulance during Game 5, and was essentially a game-day decision for Monday night's game.
Essentially a skating disaster area, Bergeron played 17:45 in Game 6. It may have been in a losing effort, but that kind of sacrifice will be talked about for a long time in hockey circles and beyond.