Boston Celtics center Robert Williams III underwent a successful arthroscopic procedure to remove loose bodies and address swelling in his left knee recently and will miss 8 to 12 weeks. View the original article to see embedded media. The Boston Celtics have a lot going on internally right now in regards to head coach Ime Udoka and his suspension, but on the court, they will begin the 2022-23 NBA season thin. Not only is Danilo Gallinair out indefinitely after undergoing left ACL surgery recently, but starting center Robert Williams III is now out indefinitely. On Friday, the Celtics announced that…