Trojans Suffer Another Loss

There is trouble at USC, where quarterback John David Booty, left, the expected replacement for Matt Leinart, could miss the rest of spring practice. Booty is sidelined because of back spasms and a possible disk problem. If he does not respond to treatment, surgery would be an option and he would probably be out until July. Booty suffered the injury Tuesday during the first practice of the spring and did not attend Thursday's practice. "We need to proceed with caution," offensive coordinator Lane Kiffin said. The next man in is freshman Mark Sanchez, who is regarded by many observers as having more potential than Booty, but Sanchez has yet to grasp the complexities of the offense. Booty's misfortune gives him the hands-on opportunity to learn. "That's exactly what [Booty] would do if our positions were reversed," he said.