EE WAS ATTEMPTING TO GET BACK INTO THE OPERATORS COMPARTMENT OF THE TAMROCK HAUL TRUCK. THE TRUCK WAS PARKED UNDERGROUND AT THE 7290 #5 STOPE ACESS. THE FRONT WHEEL WAS ON A HIGH SPOT INCREAS ING THE DISTANCE TO THE FIRST STEP. EE SLIPPED &FALL BACKWARD HITTING THE RIB OF THE DRIFT FRACTURING HIS T-5 RIB.