EMPLOYEE WAS WORKING ON ZINK FEED PUMP LINE INSTALLING 3/4"" BOLTS USING 1 1/8 WRENCH & SOCKET WITH BREAKER BAR. WHILE TIGHTENING BOLTS, HIS WRIST POPPED AND FINGERS ON RIGHT HAND BECAME NUMB. HE WAS SEEN BY A DOCTOR ON 10/7/04 WHERE HE WAS GIVEN AN INJECTION AND AN ELASTIC WRIST BAND. HE HAD SURGERY ON 11/29/04 FOR THE RIGHT WRIST AND STARTED MISSING TIME.