Bona exited Wednesday's 112-106 win over the Pistons in the fourth quarter and did not return due to an apparent head injury, finishing with five points (2-4 FG, 1-1 FT), two rebounds, one assist and one steal across 15 minutes.
Bona headed back to the locker room with trainers and never checked back in. The big man can be considered questionable ahead of Friday's game at Cleveland until the Sixers offer an update on his status.