Crowder was injured during Game 4 of the Celtics' opening-round playoff series against the Cleveland Cavaliers. During the third quarter, Cavaliers guard J.R. Smith swung at Crowder while boxing out and was assessed a flagrant-2 and automatically ejected. Crowder fell to the ground after the foul, causing the injury.
Boston said Crowder met with team physician Dr. Brian McKeon on Monday, who diagnosed the sprain. Crowder told The Boston Globe that Smith's play that caused him to twist his knee was a "cheap shot."
The 24-year-old Crowder averaged 7.7 points, 3.6 rebounds and 1.4 assists this season. He was traded to the Celtics in the December deal that sent Rajon Rondo to the Dallas Mavericks, and averaged 9.5 points and 4.6 rebounds in 57 games in Boston.
The Celtics lost the series to Cleveland in four games, ending their season.
- Molly Geary