METAL STAIRS AND RAMP WERE MOVED 20' AWAY FROM OFFICE TRAILER SO MUD COULD BE CLEANED UNDERNEATH STAIRS, RAMP AND DRIVEWAY. WHEN EE WALKED UP THE STAIRS TO HOOK CHAIN BACK ONTO FRONT END LOAD AFTER THE DRIVEWAY WAS CLEAN, COWORKER MOTIONED FOR THE LOADER TO MOVE FORWAR AND WHEN HE DID, EE STEPPED BACKWARD AND FELL OFF THE 3' LANDING ONTO HIS BACK.