At this stage in his career you can pretty much schedule Shaq's injuries. He has always been durable, but he is also extremely old to be carrying that much weight around and banging as much as he has to. I'm sure he's fine and they are just resting him. He did it for the Heat, did it for the Suns, and now he is doing it with the Celtics. He will be good to go when they need him in the playoffs (knock on wood that nothing past this happens) but I'm not too worried about this injury.