Oden undergoes fourth knee surgery (AP)

The Trail Blazers say center Greg Oden underwent an arthroscopic procedure Friday to "remove debris" from his right knee, his fourth surgery since Portland selected him with the No. 1 pick in the 2007 draft. The often-injured 7-footer had microfracture surgery on the same knee before the start of his rookie season, forcing him to postpone his NBA debut for a year.

Source: http://us.rd.yahoo.com/sports/rss/nba/SIG=11upd7fk2/*http%3A//sports.yahoo.com/nba/news?slug=ap-trailblazers-oden

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