Derrick Rose suffered a season-ending left knee injury Saturday in the Bulls' series-opening 103-91 victory over Philadelphia.There is sure to be controversy over why Rose, who missed 27 games this season with back, groin, toe, ankle and foot injuries, remained in the game when the Bulls seemed to be in control.They led by 20 with 6:07 left. But the Sixers made a late push to cut the lead.With