Tulane safety Devon Walker has had surgery to stabilize his fractured spine.

Tulane safety Devon Walker has had surgery to stabilize his fractured spine.

Dr. Greg Stewart, Tulane University's director of sports medicine, said Walker had a three-hour surgery at a Tulsa, Okla., hospital. Walker was recovering in stable condition and was expected to stay in the intensive-care unit for the next few days.

The doctor said it could be several days before they could assess the condition of his injury.

Walker was injured just before halftime in Tulane's game against Tulsa on Saturday when he and a teammate tackled a receiver, apparently smashing their helmets together.

• Arkansas took the plunge. The Razorbacks went from eighth to out of The Associated Press Top 25 rankings after a 34-31 overtime loss to Louisiana-Monroe on Saturday night.

Razorbacks quarterback Tyler Wilson missed the second half after taking a blow to the head, but coach John L. Smith said chances are good Wilson will play against Alabama on Saturday.

The Razorbacks' dive was the second-largest of any team to fall out of the Top 25, trailing only Michigan's fall from preseason No. 5 after its loss to Appalachian State in 2007.