Boston center Kendrick Perkins has tears of his ACL and PCL in his right knee and won’t be able to play in Game 7 of the NBA Finals on Thursday night. Perkins was injured midway through the first quarter of Game 6 on Tuesday. He said today, “I’ll be watching from the sidelines. I’d be lying to you if I said it didn’t hurt (to sit out). Physically, I’m doing better than I am mentally.” Boston coach Doc Rivers said he hasn’t decided on a replacement.