Ronald Leary to undergo MRI on knee

OXNARD, Calif. -- Cowboys left guard Ronald Leary missed the Wednesday morning walk-through because of a left knee problem. Leary, who said he expects to practice Thursday, will undergo an MRI.

Leary has a chronic condition in his left knee called osteochondritis dissecans (os-tee-o-kohn-DRY-tis DIS-uh-kanz), a joint condition where a piece of cartilage, along with a thin layer of the bone beneath it, comes loose from the end of a bone.

Coach Jason Garrett said this current knee problem isn't related to that.

"We don't think this is a serious thing," Garrett said. "We'll get the MRI and see what it looks like and we'll move forward."

David Arkin replaced Leary as the first-team left guard and Dennis Godfrey took over at guard for the second and third teams.

The Cowboys have health issues along the offensive line. Guards Kevin Kowalski (knee), Ryan Cook (back), Ray Dominguez (shoulder) and Nate Livings (knee) are missing camp because of injuries. To solve the shortage at the position, the Cowboys tried to sign Brandon Moore last week, but he elected to retire.

After Moore turned the Cowboys down, the team offered a contract to Brian Waters, who hasn't made a decision regarding his future.