EE STATED THAT HE HAD SQUATTED DOWN AND TWISTED SLIGHTLY TO HIS LEFT TO DRAIN THE WATER OUT OF THE AIR VALVES ON THE LUBE TRUCK. HE STATED HE FELT A POP AND IMMEDIATE PAIN WHICH HAD GOTTEN WOR SE THROUGHTOUT THE DAY. A DR APPT ON 4/20/00 INDICATED A NEED FOR SURGERY WHICH WAS CONDUCTED ON 4/28/00.