Perkins sits out practice with bum knee

Boston Celtics center Kendrick Perkins watched Saturday's practice from the sideline after his problematic right knee acted up before the session but is expected to be ready for Game 1 of the Eastern Conference finals against the Orlando Magic on Sunday.

"His knee is bothering him," Rivers said. "He tried to go early, but it started bothering him a lot. He wanted to go, but I told him, 'Look, I don't need you tonight, you're not going to help me today in practice. I need you tomorrow.' So I shut him down."