The New York Rangers’ blue line, already without Marc Staal, lost another top-four defenseman Tuesday night when Anton Stralman was forced from the game in the second period.

An injury to Anton Stralman further weakens a Rangers' blue line that was already decimated. Bruce Bennett/Getty Images

Stralman, who plays on the team’s second defensive pairing with Michael Del Zotto, was forced from the game after a hard hit from Boston’s Milan Lucic late in the second period.

Stralman did not play in the third period, which forced Rangers coach John Tortorella to lean heavily on his top pair of Ryan McDonagh and Dan Girardi.

“He’s played so well,” Tortorella said of Stralman after the team’s 2-1 loss. “That’s a big blow to us, as far as our matches and the depth within our [defense].”

Assuming Stralman is unavailable for Game 4, either veteran Roman Hamrlik or Matt Gilroy will draw into the lineup. Neither player has made an appearance yet in the 2013 playoffs.

Limited role: Struggling center Brad Richards, recently relegated to the fourth line with his poor play, saw a paltry 8:10 of ice time, only 5:58 of which was at even strength.

Richards, who might be a prime candidate for a buyout this summer, was limited to a mere three shifts in the second period and two in the third.

The 32-year-old veteran, who inked a nine-year, $60 million deal in July of 2011, has been held to one point this postseason.

World of hurt: Stralman wasn’t the only one to get banged up during Game 3.

Carl Hagelin left the game after taking a puck to the face in the third, though he returned later in the period. Chris Kreider also required medical attention when he went down to the ice, writhing in pain, after getting a stick to the eye. Kreider also remained in the game.

Power outage: The Rangers' ineptitude on the power play continued with another futile effort Tuesday night.

After failing on both man-up opportunities in Game 3, the Rangers are now 2-for-38 -- a dreadful 5.3 percent -- in the playoffs and 0-for-10 this series.

By contrast, the Bruins have had only one power play over the past two games.