EMPLOYEE ""ALLEGES"" THAT HE STRAINED HIS KNEE WHEN A TRUCK HIT THE RIPPER OF HIS GRADER. ON 9/17 DOCTOR'S OFFICE (BONE SPECIALIST) INFORMED EMPLOYER THAT EMPLOYEE HAD RECEIVED MEDICAL TREATMENT TO THIS SAME KNEE ON 5/16/02, 7/16/02, 8/27/02, 12/30/02, 3/25/03, 6/24/03, AND 8/26/03 BUT THE 7TH VISIT WAS DETERMINED TO BE DUE TO THE 8/21 INCIDENT.