Had bad backache after i delivered last year. it was exactly the area where the epidural was adminstered. it wasn't just backache, i had problems moving my legs as well, as in, deep inside my legs, one nerve gone konkers and I have problems controlling the movement of my legs.
Sounds scary.. but it went away after about 4 months... later found out that the gyne had 'problems' finding my epidural space, so maybe the needle didn't go in properly.
Today, more than a year later, whenever i do leg lifts, I still feel tinge of pain at the lower back.. i guess, this may be the long term side effects of epidural..