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Matt Barnes, will be OK according to Lakers.com:

Lakers forward Matt Barnes also had an MRI exam on his sore right knee, which was surgically repaired on January 11, 2011. Results of Barnes’ MRI showed no new damage.

[Barnes is] expected to be ready to play when the Lakers open the playoffs this weekend.

Barnes missed 26 games this season, following his knee surgery in January.

He missed the Lakers game against the Spurs on Tuesday, and did not travel with the team to Sacramento.