Von Wafer will not be available for the Rockets in their Game 6 contest with Portland on Thursday night.

Wafer, who is averaging 10.6 points and 1.2 assists in the series thus far, underwent MRI exams on Wednesday which revealed back spasms that were caused by a bulging disk.

Originally drafted in the second round of the 2005 draft by the Los Angeles Lakers, Wafer has been an integral part to Houston's success this year.  He has found a consistent spot in Rick Adelman's rotation, mainly due to the injury of regular starter Tracy McGrady.

There is no word yet if Wafer will be available for a potential game seven.  He is listed as day-to-day.