Bad, bad news for the Celtics just arrived in our inbox, via an NBA press release: “Boston Celtics center Kendrick Perkins sustained a right knee sprain and will not return to tonight’s game. His condition will be re-evaluated tomorrow. The injury occurred at the 5:30 mark of the first quarter. ” Hope Big Baby, AKA Shrek, is ready to role if Perk isn’t good to go Thursday.