Dirk Nowitzki has surgery on knee, will be out six weeks
Dirk Nowitzki will miss six weeks after undergoing knee surgery. (Ronald Martinez, Getty Images)
The Dallas Mavericks will begin their season without the cornerstone of their franchise. The team announced today that power forward Dirk Nowitzki has had arthroscopic surgery on his knee, and will not be able to resume on-court activities for six weeks.