LOS ANGELES -- Kendrick Perkins went out and the Boston Celtics' toughness went right along with him.
Perkins injured his right knee midway through the first quarter of Game 6 of the NBA finals on Tuesday night, and the Los Angeles Lakers capitalized by controlling the paint and the backboards after he left.
Los Angeles won 89-67 to force a Game 7 on Thursday night, and the Celtics will spend all the time they have until then hoping their starting centre will be available.
Because without him, they were the weaker team, outrebounded 52-39 and getting outscored by more than a 2-to-1 difference on second-chance points.
"He's one of our guys that I think gives us great spirit, gives us a lot of toughness and gives us size," Celtics coach Doc Rivers said. "You know, I hope he can play. It would be tough if he can't. Somebody else is just going to have to step forward."
Rivers said he didn't know if Perkins would be available, but said "it doesn't look good."
Perkins lacks the importance of Boston's Big Three or fellow starter Rajon Rondo, who has been perhaps the Celtics' best player during their unlikely run to the NBA finals.
But he is crucial to the Celtics' defensive schemes because he is solid enough to play his man 1-on-1, as Boston had him do against Orlando all-star Dwight Howard in the last round, and a good help defender and rebounder.
"Perk is our enforcer," Rondo said. "He's our biggest body we have to throw out there on (Andrew) Bynum. He clears the paint up for us. He does a lot of intangibles. He's a great shot blocker, rebounder, and he's the anchor of our defence."
That's become even more important this season because Kevin Garnett can't do the things he did two years ago, when he was the Defensive Player of the Year and the quarterback of Boston's defence.
Perkins was going for a rebound when he was fouled by Bynum with 5:30 remaining in the first quarter. He quickly fell to the floor and remained there for a few minutes before a pair of teammates slowly helped him to the back for X-rays, which revealed a sprain.
The Lakers led by six when Perkins went out and easily added to their advantage, fearlessly attacking the rim for powerful dunks from the likes of Shannon Brown and Jordan Farmar without a big body there to stop them -- or make them pay for their audacity.
"He's a guy that cleans the paint up, let's say, and not having him there made the Lakers awful long," Rivers said.
The Celtics have other big men, but starting Rasheed Wallace or Glen Davis weakens a bench that played such a key role in their Game 4 victory. Whatever situations they use Wallace in, he will have to be better than he was Tuesday, when he missed all seven shots and was 0 for 6 from three-point range.
The fiery Perkins came into the finals with six technical fouls during the post-season, one away from an automatic suspension. So the Celtics have faced the fear all series of potentially being without their centre at some point.
They might have to go without him Thursday in the game that will determine their season.
They will have to be better and tougher than they were Tuesday.
"You hate to see anybody, if it was this team or the other team. But we have to do this for him," Ray Allen said. "We have to push forward, and there are guys that are on the bench that can step up and make the plays that Perk is capable, or that Perk has made over the course of our time here."