The Boston Celtics might be without Kevin Garnett for the playoffs. Not just the first round, but any and all rounds, according to Celtics coach Doc Rivers. Garnett hurt his right knee Feb. 19 and has played in only four games since then, none for more than 18 minutes. Rivers told a Boston radio station today that he shut down Garnett after watching him run for 20 minutes. “He’s not going to be ready. After watching him practice, there’s no way,” Rivers said on WEEI-AM. “The way I saw him move today, I don’t know if he’ll be ready.” Rest assured the Lakers will shed no tears for the Celtics. Playing without injured center Andrew Bynum, the Lakers lost to the Celtics in six games in the NBA Finals last June.