The Islanders won 6-4 against the Penguins Tuesday night, but lost key defenseman Andrew MacDonald in tying the series 2-2.
MacDonald was forced from the game during the second period after being hit by a shot from Penguins defenseman Douglas Murray on the arm. He did not return to the ice, forcing the Isles to roll five defenseman the rest of the game.
It appears as though the Isles may be without him for the rest of the post-season as well. According to Newsday's Arthur Staple, MacDonald suffered a broken hand on the play and is unlikely to return during the playoffs.
The 25-year-old MacDonald, who plays with Travis Hamonic on the team's top defensive pairing, leads the Islanders with 23:31 minutes per game.
"He's an integral part of our team, no question," coach Jack Capuano said after the game.
Capuano said he believes that others will be able to step up in his absence. Assuming MacDonald misses Game 5, the Islanders will likely use veteran Radek Martinek, a scratch the first four games of the series.