From the Free Press:
The Pistons announced Saturday that Prince will be out indefinitely due to a small disk rupture in his lower back after an MRI exam confirmed the injury.
The Pistons didn't give a timetable, but said Prince is being treated for the injury and will be evaluated further.
Such an injury typically heals through rest, and surgery usually isn't necessary. But it's hard to say how long the recovery will be.
In other words, so much for conspiracy theories about trade talks. If you're of the mindset that the Pistons weren't championship contenders this season (and, I hate to bust your bubble, but ...), this may not be the worst thing in the world if it results in the rookies developing faster. You hate to see that come at the expense of Tay's pain and suffering, but at least there's a silver lining.