"When I came out of the ditch, there was a lady there that had flagged down a car," Petrino said Tuesday. "The guy that was in the passenger's seat said, 'Get in, we'll just take you right to the hospital instead of waiting,' and so I got in the car and they headed toward Fayetteville."
In Thursday's statement, Petrino apologized and acknowledged that he had kept quiet about Dorrell.
"I have been in constant pain, medicated and the circumstances involving the wreck have come out in bits and pieces. That said, I certainly had a concern about Jessica Dorrell's name being revealed," he said.
"Today, I've acknowledged this previous inappropriate relationship with my family and those within the athletic department administration."
The police report said Petrino was riding with Dorrell when he lost control of his motorcycle. Dorrell said in the report that she wasn't sure what caused the accident, during which Petrino was unable to maneuver a turn and laid the motorcycle down on its left side while sliding off a rural, two-lane road about 20 miles southeast of Fayetteville.
Petrino said in the report that wind and sun caused the accident. The police report said Petrino and Dorrell were taken by a passer-by to an intersection in southeast Fayetteville, where a state police officer took Petrino to the hospital.
The police report said Dorrell wasn't taken to a hospital, and that she was dropped off at her vehicle, which was parked at the intersection. State police spokesman Bill Sadler said Petrino didn't try to hide Dorrell's part in the accident when questioned.
"Coach Petrino was as cooperative as anybody that we could ever hope to encounter following the traffic crash," Sadler said.
Petrino, who wasn't wearing a helmet, was hospitalized but had since returned to practice.
Assistant head coach and linebackers coach Taver Johnson has been put in charge of the program in Petrino's absence. The former Ohio State assistant coach was hired in January.
Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.