PORTLAND -- Trail Blazers center Greg Oden underwent a followup procedure to remove debris from his right knee in Vail, Colo. Monday, team officials confirmed.
The team confirmed he would not make any games the rest of the season.
It was his fifth surgery since Portland selected him with No. 1 pick in the 2007 draft.
"This is not the news we were hoping for Greg or the organization," Blazers President Larry Miller said. "It's hard to put into words the heartbreak for everyone involved, but especially for Greg. He's a young man who has experienced a great number of physical challenges in his playing career and today is yet another significant setback for him. We have a lot of empathy for Greg and his family during this difficult time."
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.
Since then, Oden has appeared in just 82 career games for the Blazers, averaging 9.4 points and 7.3 rebounds.
Oden hasn't appeared in a game for the Blazers in two years. He also underwent surgery for a fractured kneecap in late 2009, then early last season he had microfracture surgery on his left knee.
It was expected that he might be able to play for the Blazers this season, but a checkup before the start of training camp in December reportedly revealed concerns about a non-weight-bearing ligament in the left knee, further setting back his rehabilitation. Since then, he has turned down repeated interview requests.
Oden was a restricted free agent heading into this season. The Blazers and Oden initially agreed to an $8.9 million qualifying offer for this year, but when the setback was announced the two sides restructured the deal, which was dropped to $1.5 million.
He will become an unrestricted free agent following this season.