PWinsider.com
According to several backstage sources, Triple H injured his neck at Monday's RAW telecast. His condition was so bad that, at one point, he collapsed.
The initial injury occurred during the match with Rosey and Hurricane; specifically, Rosey's legdrop put pressure on Triple H's neck and head. It was originally believed that he had a concussion, but sources have not been able to confirm the validity of such a statement.
After the match, he iced his neck and felt well enough to go back out for the final segment with Jim Ross and Batista. However, this idea turned out to be ill-advised and Triple H reaggravated the neck injury. He passed out shortly after returning to the back.
Triple H's injury was not only the likely factor in WWE's decision to cancel the advertised tag match for post-RAW, but a factor in Stephanie McMahon's decision to remain home and skip her planned trip to Ohio Valley Wrestling.