By Anne Peterson

Associated Press

PORTLAND, Ore. — Greg Oden's rookie season with the Portland Trail Blazers ended before it started when the

7-footer had knee surgery Thursday.

The top pick in the June draft went in for an exploratory procedure on his right knee and ended up having microfracture surgery, which means he will sit out the season.

"Greg looked at me as he was coming out of his surgery, and he and his mom, Zoe, probably said 'sorry' 20 times," Blazers general manager Kevin Pritchard said.

"I could feel the weight of the world on his shoulders. And as a leader and as leaders of this organization, my first thought was how lucky we were to have a guy that cares about the organization that much."

Dr. Don Roberts performed the surgery to repair the damage, which Pritchard described as the size of a fingertip. Oden is expected to be on crutches for up to eight weeks. Full recovery likely will take six to 12 months, the team said.

"At this point in time, we don't see him coming back this season," Pritchard said.

Oden averaged 15.7 points and 9.6 rebounds last season as a freshman at Ohio State.

The loss of Oden before the season was a blow to the organization. There was much fanfare when the Blazers got the first pick in the draft, and even more when the team chose Oden.

A huge, stories-tall jersey with the name Oden and a No. 1 hangs on the Rose Garden Arena. Across the street, a building is plastered with a huge billboard proclaiming "The Road Back to Rip City" with larger-than-life photos of Oden and teammates Brandon Roy and LaMarcus Aldridge.

"To know that Greg wouldn't be with us, it was disappointing," coach Nate McMillan said. "I was really looking forward to working with him, and developing this team. You know we will still get that opportunity, but it will just come a year from now."

It was Oden's second health problem since the Trail Blazers drafted him. He had a tonsillectomy in July after struggling in two Las Vegas summer league games.

Oden recovered and had been working out in the Portland area. The MRI was taken Thursday after he had some swelling in the knee.

Despite being hampered by a wrist injury at Ohio State, Oden led the Buckeyes to the national championship game. He had 25 points and 12 rebounds in the loss to Florida.

The Trail Blazers were the surprise winners of the NBA draft lottery, and chose Oden over Texas forward Kevin Durant, who went to Seattle.