Portland Trail Blazers center Greg Oden will undergo microfracture surgery on his left knee Friday and will miss the remainder of the 2010-11 season, the Trail Blazers announced this evening. Oden, 22, has been sidelined since fracturing his left patella in a Dec. 5, 2009, game vs. Houston. Oden previously underwent microfracture surgery on his right knee Sept. 13, 2007. Greg Oden out for season, will have microfracture surgery :InsideHoops