According to Carey Murdock at SoonerScoop ($), OU center Ben Habern recently had neck surgery caused from an injury that dated all the way back to his high school days. Evidently Murdock had been given the story, but sat on it out of respect to his source who didn't want the news to get out there until Oklahoma and Habern had been assured of the surgery's success. This has apparently taken place, which for OU but especially for Habern (and his family) is extremely good news.
Evidently, Habern will be in a neck brace for the next 4-6 weeks and is almost guaranteed to be held out of spring practices. But this is not expected to be career threatening and the coaches are fully anticipating him being ready to go this summer.