EE WAS USING A 1"" IMPACT WRENCH TO TIGHTEN BOLTS ON A DRAGLINE SWING MOTOR. HIS RIGHT ELBOW & ARM STARTED HURTING AT THIS TIME. ON 5/22/02 HIS CONDITION WAS DIAGNOSED AS LATERAL EPICONDYLITIS. ON HIS 2ND VISIT TO THE DOCTOR 6/5/02, THE PHYSICIAN ASSISTANT DIAGNOSED HIS CONDITION AS TENDINITIS & HE RESTRICTED THE USE OF HIS RIGHT ARM/ELBOW. FIRST DAY OF RESTRICTED DUTY 6/6/02.