Before the Philadelphia 76ers traded for him, Andrew Bynum had his knees checked out by four doctors who were all comfortable approving that he would play for the team this season, according to sources.

Then, however, Bynum "tweaked" his right knee during a workout while doing up-and-under moves. When another MRI was taken at that point, sources said it revealed a bone bruise and more significant cartilage issues.

Bynum has yet to play all season long and hinted at sitting out the entire campaign Friday, adding he does not "want to play with pain."