EMPLOYEE WAS RIGGING A MAGNET TOWER FOR LIFTING WITH CRANE WHEN TOWER SHIFTED CASUING EMPLOYEE TO SLIP ON STEEL, CAUSING A RED PLACE BEHIND HIS RIGHT KNEE. HE DID NOT SEEK MEDICAL TREATMENT UN TIL 8/21/02. HE HAS BEEN REFERRED FOR A MRI FOR A DIAGNOSIS. NO WORK UNTIL FURTHER NOTICE.