EMPLOYEE WAS WALKING BEHIND A CO-WORKER WHO WAS PERFORMING MAINTENANCE AT A WATER WELL LOCATION. CO-WORKER WAS CROUCHED DOWN, AND FELL BACKWARDS AFTER LOSING HIS BALANCE. CO-WORKER FELL ONTO I NJURED EMPLOYEE'S RIGHT KNEE. INJURY BECAME ""LOST TIME"" BEGINNING 11/28/01 AFTER EMPLOYEE'S PHYSICIAN DETERMINED EMPLOYEE REQUIRED TIME AWAY FROM WORK TO RECUPERATE.