Bernier's left knee appeared to bend awkwardly after Paul Ranger pushed Bruins centre Patrice Bergeron into him. The Leafs' starting goaltender remained down on the ice in pain before he was forced to leave the game.
Backup James Reimer began stretching immediately when Bernier was injured and entered at the 7:22 mark of the third period.
Bernier missed five straight games in March with a groin injury. This was his fifth straight game since returning from that absence.
The Leafs led the Bruins 3-2 when Bernier left the game. He stopped 25 of the 27 shots he faced.
I have been blessed to play for 16 years in the NHL; it has been an amazing ride. I would like to thank the Tampa Bay Lightning and New York Rangers organizations and owners for providing me the opportunity to play the sport I love for so many years. I could have never played for so long or accomplished all that I have without the unwavering love and support from my wife, Heather, our three sons, Ryan, Lucas, and Mason, and my parents.
— Martin St. Louis after announcing his retirement from the NHL on Thursday