Trail Blazers center Greg Oden, the No. 1 pick in the NBA draft, will undergo exploratory arthroscopic surgery this week because of pain in his right knee.

An MRI taken last week showed Oden may have some cartilage problems, general manager Kevin Pritchard said Monday.

A timetable for Oden's return will be set following the surgery, which will take place Thursday in Vancouver, Wash. The Trail Blazers open training camp in three weeks and the regular season starts Oct. 30.