CLIMBING DOWN FROM D9 DOZER (SERVICING MACHINE) WHEN HE FELL BACK OFF HITTING HIS BACK ON ROLLER FRAME AND THEN HITTING THE GROUND ON THE SIDE OF HIS FOOT. HE WORKED THE REST OF SHIFT BEYOND 0 400 UNTIL 0530. GOING FOLLOWING DAY TO DR. DID NOT REPORT TO WORK 10-24-01 ON 2ND SHIFT.