The number one overall pick of the 2009 NBA Draft, Blake Griffin will miss the entire 2009-10 season after it was discovered he would need season-ending surgery to his knee.

From NBA.com: After experiencing some discomfort during his recently-accelerated rehabilitation program, Clippers’ forward Blake Griffin was examined Tuesday afternoon by Dr. Neal ElAttrache in Los Angeles.

As a result of that exam, it has been determined that the healing in his left patella area has not improved to the expected required level.

Griffin will undergo a surgical procedure in the near future, with a recovery prognosis of four to six months. Team personnel will be made available to the media. Further details will be made available as events develop.

Previously on December 23rd, after undergoing a CT Scan and MRI Griffin had been cleared to increase his rehabilitation workload.

Griffin, the first overall selection in the 2009 NBA Draft, suffered a non-displaced stress fracture of his left patella during the Clippers’ last preseason game vs. the New Orleans Hornets on Friday, October 23rd.

Griffin initially injured himself, after he landed from a high-flying, powerful slam dunk, in a preseason game a few days before the start of the regular season. He was set to return to the Los Angeles Clippers at the end of the month.