It might be a good idea to look into a new MRI - just for comparison and to check things, esp since it's been 4 yrs.
You might look up more about reversed lordosis too-
here's a few related links on that-
http://www.emedicine.com/sports/TOPIC19.HTM
this site is technical but I found it very interesting-
http://www.idealspine.com/pages/cbp_technique.htm