Published November 20, 2014
Butler suffered the injury, a rupture to his right patellar tendon, in Saturday's 99-87 loss to Milwaukee.
"He is expected to miss the remainder of the season," said a statement from the Mavericks, who are in second place in the Western Conference with a 25-8 record.
Butler was averaging 15 points and 4.1 rebounds in 29 games this season, his ninth in the NBA.
(Reporting by Simon Evans in Miami, editing by Steve Ginsburg)