According to Brian Windhorst of ESPN, Andrew Bynum’s recent setback happened while he was bowling. Windhorst says that, “Multiple sources told ESPN on Saturday that Bynum suffered an unspecified injury this month while bowling. On Friday, Bynum revealed that — on top of the issues with his right knee that could keep him sidelined until January — he also had suffered a “setback” with his left knee.”
"I had a little bit of a setback, and we're just working through some issues with the right knee," Bynum said before the Sixers beat the Utah Jazz on Friday night. "I kind of have a mirror thing going on with my left knee. I don't know what's going on, but the doctors are saying pretty much that it's a weakened cartilage state."
NBA players are forbidden to ride motorcycles or even snowboard while they are under contract, however, bowling is nowhere found on that list. This was purely a wisdom issue. Had Bynum used better judgment on whether or not to bowl in the midst of rehabbing his knee, he may already be on the court by now.
Everyone knows how talented Andrew Bynum is, but his maturation level has a long way to catch up to his talent level if he wants to reach the potential that we all see in him.