EMPLOYEE WAS WALKING DOWN BOTTOM FLIGHT OF STEPSTO CEMENT CLINKER COOLER PIT TO MAKE A DAILY IN-SPECTION OF THE AREA WHEN HE MISSED A STEP AND STRAINED HIS LOWER BACK. EMPLOYEE WAS GIVEN OSTEOPATHIC MANIPULATIVE TREATMENT AND PLACED ONRESTRICTED DUTY. RETURNED TO REGULAR DUTY ON 11/05/01.