INJURED STATED THAT HIS BACK HURT; HE CALLED ANDTOLD THE MINE MGR THAT HIS X-RAY SHOWED A BIRTH DEFECT THAT WAS CAUSING THE PAIN. THE MINE MGR THOUGHT THE INCIDENT WAS SOLELY CAUSED BY BIRTH DEFECT. LAST WEEK A DR DECIDED THAT INJURY WAS A RESULT OF IRRITATION OF BIRTH DEFECT FROM RUN-NING SHUTTLE CAR.