Straka was skating inside the Boston zone when his left skate got locked up with the skate of Bruins defenceman Andrew Ference with 5:23 remaining in the period. His right leg stretched out and stuck in the ice.
The left-wing, who has been playing despite a sore left shoulder, went down and sprawled out on his stomach. Straka received attention by the Rangers' training staff and reached for his knee before getting to his feet. He was helped off by teammates Dan Girardi and Marek Malik, putting weight only on his left leg while the right foot dangled a few inches above the ice.
He didn't return to the game and was listed as day to day.
It is the latest injury to strike the Rangers, who are trying to reach the post-season for the second straight season.
New York, which entered the game in ninth place in the Eastern Conference, was already without forward Brendan Shanahan (concussion), forward Marcel Hossa (knee), and defencemen Fedor Tyutin (knee) and Karel Rachunek (knee). Each player got hurt within the past month.
Straka, 34, has 27 goals and 38 assists this season but hasn't found the net in 10 games - dating to Feb. 18. He hurt his shoulder six days later against Columbus and sat out the next three games. He has no points in the seven games he's played since.