The team says in a news release that Artest didn't travel with the Lakers to Saturday's game at Sacramento after tripping over a box and falling down a flight of stairs at his home on Christmas night.
He was treated at UCLA Medical Center, undergoing a CT scan and receiving stitches in the back of his head and his elbow.
He's expected to be examined by a neurologist later Saturday, when the Lakers will be able to estimate when Artest can rejoin the team.
Lakers coach Phil Jackson allowed his team to stay home on Christmas night after Los Angeles' 102-87 loss to Cleveland, flying to Sacramento on Saturday morning.