THE EMPLOYEE STATED HE GOT OUT OF THE NO. 6 MANTRIP TO ALLOW THE TRIP TO PULL UP A HILL AND WALKED TO GET BACK IN THE TRIP WHEN HE SLIPPED & FELL. HE HIT HIS KNEE AGAINST THE MANTRIP. THE EMPLOYEE HAD AN MRI SCHEDULED BUT DUE TO THE UNAVAILABILITY OF THE DOCTOR WAS NOT TOLD UNTIL 9/12/05 THAT HE WOULD NEED THERAPY & WOULD BE OFF WORK TO DETERMINE IF SURGERY IS NECESSARY.