Mavericks forward Caron Butler has undergone surgery to repair a torn tendon in his right knee and will likely miss the rest of the season.
His absence will be quite a blow for Dallas, which was second in the Western Conference at 25-8 going into a game against Portland on Tuesday night.
Butler was Dallas' third-leading scorer, averaging 14 points and 4.1 rebounds in almost 30 minutes per game. He was an inside-out force the Mavs relied on to draw defenses from leading scorer Dirk Nowitzki.
It could be a costly injury for Butler because he will become a free agent this summer.