The Bruins announced on Sunday that defenseman Johnny Boychuk  will be out for approximately four weeks after suffering a slight fracture to the ulna bone in his left forearm on Saturday.
Boychuk was slashed by the Rangers’ Brandon Dubinsky in the first period of the team’s 3-2 and went to the training room immediately thereafter. Though he returned to play in the first period, he did not play in the second or third periods.
The 26-year-old Boychuk, who signed a two-year extension with the Bruins over the summer, has three assists on the season. He has played alongside Zdeno Chara  in the team’s top defensive pairing, and it’s uncertain whether Adam McQuaid, who has been a healthy scratch for each of the B’s six games this season is his definite replacement in the lineup. The Bruins cut Matt Bartkowski late in camp with the idea that the former Ohio State blueliner was best served in a situation in which he could get playing time, so he is also an obvious candidate to be in the mix. Through four games this season, Bartkowski has one point, an assist.