In moves that shook up the entire NBA, the Celtics  pulled off three deadline deals that will affect them now and in the future. According to a source, team president Danny Ainge traded Kendrick Perkins  and Nate Robinson  to Oklahoma City for forward Jeff Green  and center Nenad Krstic .
In a separate deal, the Celtics also dealt rookies Luke Harangody and Semih Erden for a second-round draft pick. That deal is about clearing roster space for veteran free agents who are expected to be bought out of their contracts, most notably Troy Murphy .
The Celtics also traded Marquis Daniels  to Sacramento for cash. As a player with Early Bird contract rights Daniels had the right to veto the trade, but his agent, Mark Bartelstein, said that he would not. They are more concerned with Daniels’ health than his career at the moment.
But it’s the initial deal that was so shocking. Perkins has recently returned from a torn ACL in his right knee and had moved quickly back into the starting lineup. But Perkins injured his left knee against the Warriors and was going to be held out of the rest of the team’s West Coast trip. With Jermaine O’Neal  and Shaquille O’Neal  also sidelined by injuries, Perkins was the only veteran center left standing.
With Perkins gone, the oft-repeated line from coach Doc Rivers  that no one had ever defeated the Celtics with their starting five will stand.
Robinson, on the other hand, was rumored to be available for the last week. His inconsistent play, and the return of Delonte West  made him expendable.
In return, the Celtics received Green and Krstic. Ironically, Green was drafted with the fifth pick in the 2007 draft, which the Celtics used to acquire Ray Allen . Green is averaging 15 points and 5.6 rebounds for the Thunder, but he is a poor 3-point shooter and not much of a rebounder for his size. Krstic is a veteran 7-footer who will help fill in some of the gaps left by Perkins, but the two are very different players.
There’s still more coming. The Celtics will have 12 players left on their roster. That opens the door for Ainge to sign as many as three veteran free agents. Murphy is one name who has been mentioned most prominently, although the Celtics figure to have competition from Miami, among other contenders.
Beyond this season, these moves could clear ample cap space for the future. Krstic will be an unrestricted free agent after this season and Green will be restricted. With only Rajon Rondo , Paul Pierce  and Avery Bradley  under contract beyond the 2012 season, the Celtics could be prime players in the next great free agent class that is likely to include Dwight Howard , among others.
The present is cloudy at best. First and foremost will be restoring calm to a locker room that is among the tightest in the league. Perkins was a major force in that both on the court, and off. Second, is how Rivers intends to use Green who is a versatile forward. With Green and Glen Davis , the Celtics could use a variety of lineups to counter teams like Miami and the new-look Knicks.