THE EE WAS HELPING ANOTHER EE REMOVE A SIMPLEX JACK FROM UNDER THE BELT. HE WAS STRIKING IT WITH A DRILL STEEL AND WHEN HE STRUCK THE JACK WITH THE STEEL IT CAUSED PAIN AND DISCOMFORT TO HIS L EFT THUMB. HE CONTINUED TO HAVE A SORE THUMB ANDSAW A SPECIALIST ON 3-19-01. IT WAS DECIDED THAT THE THUMB WAS DISLOCATED. HE WAS RELEASED TO RESTRICTED DUTY 3-20-01.