EE WAS PULLING A GREASE HOSE OFF A REEL TO GET ENOUGH TO REACH A PULLEY. WHEN ANOTHER EE PULLED ON THE LINE TO HELP THE EXTRA SLACK CAUSED THE EE TO STUMBLE. HE WENT FORWARD TO TRY TO REGAIN H IS BALANCE. HE THEN STEPPED ON A ROCK AND FELL TO THE GROUND AND TWISTED HIS RIGHT SIDE. COMPANY WAS NOT AWARE UNTIL 9/19/02.