After the Bruins muddled through the kind of road trip that they just concluded, you figured something had to give.

And yesterday morning, it did.

Coach Claude Julien watched his team score a whopping six goals on the dismal four-game trip that produced only two points in the standings, so he decided to make wholesale changes in his forward lines at yesterday’s Garden practice.

Milan Lucic was dropped to the third line with Rich Peverley and Jordan Caron; Brad Marchand was moved to the David Krejci-Nathan Horton line; Daniel Paille jumped up to skate with Patrice Bergeron and Tyler Seguin; and Jay Pandolfo skated with Gregory Campbell and Shawn Thornton, with Lane MacDermid in the Merlot mix as well.

The reason?

“Because I can,” Julien said with a smile. “I’m the coach and every once in a while you have to do things like that. It’s as simple as that.”

Another answer to that question could have been, “Why not?” The Krejci line has looked out of sync for a while now, with the exception of a 4-1 win over the Washington Capitals nine days ago. Lucic had a bad game in Saturday’s 3-2 loss in Toronto, but he’s hardly been a consistent weak link on that line, despite the fact he hasn’t scored a goal 15 games. Each of the three players could shoulder the blame at times.

The third line has been a going concern all season and, with Chris Kelly out, it had essentially become a fourth line.

Even the Bergeron line, by far the most consistent unit this year, had shown some cracks, especially in Toronto. On a 2-on-1, Seguin passed up a great shooting lane to send Marchand a feed that never connected, while Marchand, the team’s leading goalscorer, had issues controlling the puck.

The only unit that had been improving was the Paille-Campbell-Thornton trio, but that had to be sacrificed for the greater good. At least that’s the theory.