First I'd seen on what the actual injury was. According to Beilein, it popped out, and then back in and they won't know the full extent of damage until he gets it looked at in the next day or so. Best of luck on the recovery.
From the DetNews:
http://www.detroitnews.com/article/20121216/SPORTS0201/212160321/




tough break
the supreme head butt