EE PICKED UP ON A CORNER OF A 1 1/2 INCH THICK, 3' X 5', PIECE OF STEEL PLATE TO REMOVE A STRAP. THE PLATE WAS ON A TABLE. WHEN HE LIFTED, HE FELT PAIN IN HIS LOW BACK. EE SEES A CHIROPRACTOR ON A REGULAR BASIS BECAUSE OF LOW BACK PROBLEMS. BACK GOES OUT OF ALIGNMENT. WENT TO CHIROPRACTOR ON 2-15 AND ON 2-18.