Lowry jammed the finger while deflecting a ball in the second quarter. During the subsequent timeout, the Raptors' medical staff attended to Lowry's hand on the bench. He returned to play but went back to the locker room with 2:41 remaining in the first half.
Lowry, who was wearing a splint on the finger during the postgame news conference, started the second half for the Raptors and finished with 14 points, 9 assists and 4 rebounds in 26 minutes.
Toronto moves on to face the Philadelphia 76ers in the conference semifinals.
"It popped out, but it's fine," Lowry said. "I popped it back in. Got a couple days to get it back and recover, and hopefully it will be better by Game 1. Well, it will be better by Game 1."
After going scoreless on 0-for-7 shooting from the field in the Raptors' Game 1 loss to Orlando, Lowry recovered to average 14.8 points on an effective field goal percentage of 61.0, along with 8.8 assists and 4.3 rebounds as the Raptors stormed back with four consecutive wins to close out Orlando.
"We know what we are, and what we can be," Lowry said. "We're just playing, day by day, game by game, possession by possession. We're not getting too up. We're not getting too down. We're just going out there and playing."