BOSTON — It’s no secret that the Chicago Bulls are a much better team with a healthy Derrick Rose.

He showed that again Friday afternoon when the Bulls were struggling to get consistent offense.

Rose scored 14 of his 21 points in the second half – 12 coming early in the third quarter – to help the Bulls pull away for a 109-102 win over the Boston Celtics.

“When he plays like that, it’s huge for our team,” Chicago Coach Tom Thibodeau said. “When you look at his plus-minus when he’s on the floor for our team this year, it’s off the charts. When he’s on the floor it makes a big difference for our team. I think we all know that.”

Rose missed large portions of the past two seasons with serious knee injuries. He’s been struggling to stay in the lineup this year due to ankle and hamstring injuries.

“The confidence is through the roof,” he said. “I don’t need more confidence. I just need to play. I know how good I am and how good I can be. It’s just I need to be out there playing.”

Jimmy Butler hit four free throws late in the game and finished with 22 points for Chicago, which had lost four of its previous six games.

Pau Gasol had 15 points and 15 rebounds, and Joakim Noah added 15 points and 14 boards for the Bulls.

“Every time he’s on the court he makes our team better,” Noah said of Rose. “Any time he’s on the court it just makes us that much more dangerous.”

Rose was held to seven points in the opening half before the 2010-11 MVP scored 12 in the opening four minutes of the second half. After he went to the bench with 4:52 left in the third, he didn’t return until 7:02 remained in the game.

Jared Sullinger led Boston with 23 points and 10 rebounds. Avery Bradley had 18 points and Brandon Bass 16 with nine boards. Rajon Rondo had eight points, seven rebounds and nine assists for the Celtics, who have lost 6 of 7.

Boston shot 19.2 percent (5 of 26) in the final quarter.

“I’m not going to lose any sleep over the ball not going into the basket,” Boston Coach Brad Stevens said. “We’ve got to finish. That’s the bottom line.”

With the score tied at 100, Jeff Green’s driving basket put the Celtics ahead with 21/2 minutes left. Butler’s two free throws tied it with 1:20 to play.

Rondo missed two free throws and Sullinger front-rimmed an attempted 3 before Butler’s two free throws moved the Bulls ahead for good, 104-102 with 51 seconds left. Noah then nailed a short jumper on their next possession.

“We had a lot of open shots that didn’t fall in the fourth,” Sullinger said.

Boston missed 17 of its first 20 shots in the final quarter before Sullinger’s conventional three-point play tied it at 100 with three minutes to play. He was fouled driving down the lane by Noah.