THE EE WAS ATTEMPTING TO MOVE SOME PLASTIC PIPE.HIS FOOT SLIPPED CAUSING HIS BODY TO REACT IN REGAINING HIS BALANCE. THE EE FELT A SHARP PAIN IN HIS LOWER BACK AND ABDOMEN. UPON MEDICAL EVALUATION THE EE WAS DIAGNOSED WITH A STRAIN TO THE LOWER BACK AND ABDOMEN. THIS RESULTED IN RESTRICTED DUTY.