EE WAS ATTEMPTING TO PICK A LOAD OF WIRE SCREEN FROM A FLATBED TRUCK USING A BOOM TRUCK. THE LOAD WAS TOO HEAVY FOR THE TRUCK AND OPERATOR ERROR CAUSED THE TRUCK TO OVERTURN. EE FELL TO THE GR OUND, STRIKING HIS ELBOW ON THE GROUND. NO INJURY WAS FOUND ON THE DATE OF ACCIDENT BUT HE HAD FLUID DRAINED FROM THE ELBOW ON 5-21-03.