PARTIALLY BENT OVER REMOVING AN ITEM FROM A 2 DOOR CABINET IN THE MAINTENANCE SHOP. ANOTHER EMPLOYEE APPROACHED FROM BEHIND, PLACING HIS HANDS ON HIS BACK TO GET HIS ATTENTION. BEING IN AN AWK WARD POSITION, EMPLOYEE JERKED BACK TO KEEP FROM FALLING, CAUSING SEVERE PAIN IN LOWER BACK, HIP, AND LEFT LEG.