PORTLAND, Ore. -- Trail Blazers center Greg Oden, the former No. 1 draft pick whose short career has been marred by injuries, will have microfracture surgery on his left knee and will not play this season.
Oden hasn't played since last December because he needed surgery to repair a fractured left patella. The Blazers say this operation, announced Wednesday night and scheduled for Friday in Vail, Colo., will repair damaged cartilage and is unrelated to the patella injury.
Oden, the first name announced in the 2007 NBA draft, missed his rookie season because of microfracture surgery on his right knee. The procedure stimulates cartilage growth.
Blazers trainer Jay Jensen said the latest problem with Oden's left knee became apparent about two weeks ago when he experienced some pain and fluid in the joint. Soon thereafter, an MRI revealed the damage.
"We sat there and it was like we'd been kicked in the stomach," Jensen said, choking up. "It felt like hearing someone close to us had died."
Oden was having arguably the best season of his career when he broke his left kneecap during a game last December against the Houston Rockets. He was averaging 11.7 points, 8.8 rebounds and 2.4 blocks as a starter.
The Blazers picked Oden instead of Kevin Durant, who went to the Oklahoma City franchise and has blossomed into one of the NBA's best players.
Another Portland big man, Bill Walton, was selected by the Blazers with the No. 1 pick in the 1974 draft, but he was dogged by a broken nose, foot, wrist and leg over his first two seasons before helping the team to the NBA championship in 1977.
"Some things you just can't explain," Blazers coach Nate McMillan said.
It had been expected that Oden would play this season, but at the start of fall practice he said he wasn't close. When asked at the time if he could return by Christmas, Oden shrugged his shoulders and threw up his hands.
The former Ohio State star has played in only 82 games over parts of two seasons, averaging 9.4 points and 7.3 rebounds.
McMillan said he spoke to Oden on Wednesday.
"As you can expect, the young man is devastated by not having the opportunity to play this season. ... It's like 'Here we go again' for him."
Jensen said Oden has a hole in the articular cartilage on the end of a bone in his knee. It is unclear what caused the damage.
Jensen also said he was as perplexed as anyone as to why Oden was injury-prone. The 22-year-old had MRIs on both knees prior to the 2007 draft, which one onlooker called "pristine," the trainer said.
Asked whether he would be able to come back after the latest blow, Jensen said: "I believe in Greg Oden."
The Blazers announced last month they would not offer Oden a contract extension. He was the first No. 1 pick since Kwame Brown not to get one at the end of his rookie contract.
Oden will be a restricted free agent next summer and the Blazers will be able to match any offers for him.
In Oden's absence, the Blazers largely have relied on center Joel Przybilla, but Przybilla also was injured last December and required knee surgery. The Blazers have since started veteran forward Marcus Camby in the middle.
The Blazers were further hurt at the position at the start of this season when Jeff Pendergraph, who was backing up Camby, injured his knee and required season-ending surgery.
Przybilla already has returned to practice and has said he expects to be back by Thanksgiving.
The Blazers also announced Wednesday that All-Star guard Brandon Roy would miss the next two games because of a sore left knee. Roy recently underwent an MRI exam and team doctors determined there is no immediate need for surgery. He will be evaluated again next week.
A three-time All-Star, Roy left the Blazers' game at New Orleans on Saturday with a pronounced limp after playing 22 minutes.
Roy, who leads the team with 18.1 points per game, had expressed concern about his knees after playing significant minutes early in the season.
The Blazers host Denver on Thursday and Utah on Saturday.