EMPLOYEE WAS REMOVING A TIRE FROM A SEMI TRACTOR WHEN IT SHIFTED AND HE LOST CONTROL OF THE TIRE/WHEEL AND IT FELL ONTO HIS LEFT ANKLE/LEG. EMPLOYEE SUSTAINED A CONTUSION AND CONTINUED TO WORK REGULAR DUTIES. ANKLE CONTINUED TO HAVE PAIN AND CONTUSION DID NOT GO AWAY. ON 2/9/04, EMPLOYEE HAD ANKLE EXAMINED AND WAS DIAGNOSED WITH A FRACTURED FIBULA.