i have gone thru 5 ops and each time numbness has been something i also had,i know it is very annoying but it will return but not completely in about 6 months.can i also try and advise you against further surgerey,it dosnt rearly improve your problem,it just causes more scar tissue inside that if like me will endup with you needing an op to remove it,you must come to terms with your dissability,and demand stronger pain relief.
i hope this makes you see your problem more clearly bye

Have they checked an ilium upslip form you? That was the reason for my leg numbness. I hear it is very common disorder and usually misdiagnosed...

what is it?

Very common but doctors don't much know about it. Here I have collected some info. I hope it is allowed to show these links..

http://www.selkasivut.fi/selka/links.html
http://www.selkasivut.fi/selka/others.html

I still have numbness and stabbing pains in my feet 1 and 1/2 year after my fusion (l3-l4-l5-s1) but it's an improvement, since I woke up from surgery unable to move my legs. If you still have nerve pain in your feet and can't live with it, you may want to ask your doctor about anti-epileptic drugs. In small doses they are the best treatment for nerve pain, but they have plenty of side effects, so be careful.