Mavericks' Nowitzki has surgery, out six weeks

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http://api.tweetmeme.com/imagebutton.gif?url=http://espn.go.com/dallas/nba/story/_/id/8524290/dirk-nowitzki-dallas-mavericks-undergoes-arthroscopic-surgery-knee (http://api.tweetmeme.com/share?url=http://espn.go.com/dallas/nba/story/_/id/8524290/dirk-nowitzki-dallas-mavericks-undergoes-arthroscopic-surgery-knee&service=bit.ly&source=espn)Dallas Mavericks star Dirk Nowitzki underwent arthroscopic surgery on his bothersome right knee Friday.

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