INJURED WAS BENT DOWN INSTALLING A SEAL IN THE LOADER ON AN UNEVEN AREA IN THE MAIN SHOP. WHEN HE STOOD UP HIS RIGHT KNEE POPPED AND THEN LOCKED UP. NO REPORTABLE MEDICAL CARE HAD BEEN GIVEN T O DATE. INJURY WILL NOT BECOME REPORTABLE UNTIL 3/12/02 WHEN SURGERY IS SCHEDULED. INJURED HAS BEEN WORKING FULL DUTY SINCE THE TIME OF THE INCIDENT.