> Memphis selected Perkins with the 27th overall pick in the 2003 draft out of Clifton J. Ozen High School in Beaumont, Texas, and then traded him to the Celtics. Perkins has played just 12 games this season and is averaging 7.3 points and 8.1 rebounds in 26.1 minutes. His career averages are 6.4 points and 6.0 rebounds in 22.3 minutes. The Thunder's acquisitions at center also will allow 6-foot-10, 235-pound Serge Ibaka to become a starter at his more natural power forward position. Off the bench comes 6-foot-10, 250-pound veteran enforcer Nick Collison. Collison and Ibaka likely will start during the transition period, or until Perkins is healthy enough to return. Mohammed has started 30 of 51 games this season with the Bobcats, averaging 7.3 points and 4.9 rebounds in just 16.7 minutes. The athletic, 5-foot-9 Robinson won three NBA dunk competitions during All-Star Weekend and is a career 35.4-percent shooter from 3-point range. The 26-year-old Robinson played collegiately at Washington, was selected 21st overall by the Phoenix Suns in 2005 and was traded to the Knicks. He has career averages of 11.3 points, 2.6 assists and 2.6 rebounds. He has 72 starts in 393 career games. Robinson is signed through 2011-12 at $4.2 million this season and $4.5 million next season. The 7-foot Krstic was picked 24th overall in 2002 and played four seasons in New Jersey Nets and spent the last three seasons with the Thunder. He is averaging 10.1 points and 5.4 rebounds in his career. The 27-year-old Krstic is in the final year of his contract that pays him $5.8 million this season. The 33-year-old Peterson is in the final year of a deal that pays him $6,641,440. The 33-year-old Mohammed is at the end of a deal that pays him $6,883,800. Mayberry: Five quick thoughts Sound-Off: Thunder fans react to the trade Photo Gallery: Meet Perkins and Robinson Photo Gallery: Best of Green and Krstic Tramel: Trades mean belief in Ibaka & Harden Sound-Off: What did you think of the trade?