Shaq will be questionable for each and every game. He can't be relied upon at all and that is going to be a major problem, although i think we get past round one without him assuming the big 3 don't falter.
IMO his injury is a little more than we are being let in on and his legs are going to be a problem throughout the playoffs, I see the celts. resting him in non-essential games throughout the playoffs, that is probably the best we can hope for really.