The Herald has this release from the league:
NEW YORK, Feb. 10, 2008 – Detroit Pistons forward Rasheed Wallace has been named by NBA Commissioner David Stern to replace injured East All-Star Kevin Garnett (abdominal muscle strain) of the Boston Celtics for the 2008 NBA All-Star Game on Sunday, Feb. 17 in New Orleans.
Wallace will be making his fourth NBA All-Star appearance. East All-Star head coach Doc Rivers will determine which player on his roster will replace Garnett in the starting line-up.