If you're asking for insider information, I don't have that.
But I do have enough knowledge on the injury to know that he had a collision a year earlier with Maggette that was located at precisely the same location in which the patella fractured but was just called a "chip". The fracture that happened didn't happen with contact, but with pressure asserted from to the tendon while lunging down to jump. While he's big and strong, the pressure needed to snap a patella on a world-class 20 year old athlete is incredible, and the traditionally it could only happen with some type of fatigue to the bone through disease or Osteoporosis, or a previous injury that fatigued the bone and never healed correctly. This is 2010 and I can tell you with 100% certainty that it not the genetics issue (like Bill Walton and other athletes back in the days prior to modern medicine being able to rule that out). So it really isn't too much of a SWAG to know what could have weakened the bone, especially since there is evidence of the two injuries showing them in the same location.