WHILE DESCENDING A FIXED LADDER ON THE NE CORNER OF THE WEST OVERHEAD CRANE THE EMPLOYEE FELT A ""PULL"" IN HIS RIGHT SHOULDER. THE EMPLOYEE WENT AHEAD TO THE LOWER LEVEL AND WHILE REACHING ABOV E HIS HEAD WITH BOTH ARMS TO TIGHTEN A BOLT ONTOA NUT HIS RIGHT SHOULDER CAME OUT OF SOCKET. THE EMPLOYEE HAD SHOULDER SURGERY AND HIS FIRST LOST WORK DAY WAS MAY 14TH,2001.