If the Celtics  want to rebound from their Game 3 loss, they know they have to rebound in Game 4.
“I think whoever wins the rebounding war wins the game,” said Kendrick Perkins . “That’s how it’s been in the last three games for some reason.”
The Celtics have been outrebounded 124-110 in the first three games of the series, an average of 41 to 37.
They had a five-board edge in their Game 2 victory, but were outrebounded by a total of 19 boards in their Games 1 and 3 losses.
Perkins said the length of the Lakers big men, Pau Gasol  and Andrew Bynum , make them tough to defend. Gasol’s versatility to play the power forward also spreads the floor and creates additional defensive challenges for the Celtics.
But the Celtics can win the battle of the boards. They have already proved it in this series. There’s nothing complicated about it, just a matter of going out and doing it.
“I just feel like it’s got to be a team effort,” said Perkins. “Guys have got to come in, make them take contested jumpshots, grab a lot of long rebounds. Our guards come in and they can start the break.
“But I just think when we put our minds together and go out there and do it, I just think with Paul (Pierce ) and (Rajon) Rondo  and Ray (Allen ), they can grab a few rebounds. Then Kevin (Garnett ) and myself, we’ve got to do what we’ve got to do. Then when the bench comes in, they’ve got to make sure that they rebound also.”
The Celtics know the gameplan. Now they have to execute it.
“It’s just us,” said Glen Davis . “We’ve got to show up tonight. We’ve got to make sure that we do what we have to do.”