Im 27 and have had 3 back surgies since Feb of 08. My last was a revision pliff. If anyone knows, when doctor replaces screws does he use a different location of the spine or the same location. Doc says he used larger screws. Common sense says he used the same. Since the surgery the pain has become worse, and went to another doc and they are thinking that the screws have come loose and have striped out the hole.