WAS WORKING ON TOP OF CRUSHER AND WAS BENDING OVER RAIL TO PULL A BUCKET OF TOOL UP WITH A ROPE AS HE WAS PULLING THE ROPE HE STRAINED HIS BACK WHICH HE HAD ALBREADY INJURED FROM A PREVIOUS IN JURY AT ANOTHER PREIVOUS EE . EE CAME BACK TO WORK ON 2-28-02 BUT WENT TO HOSPTIAL ON 3-5-02 FOR TREATMENT. WAS OFF SIDE 3- & 5-02.