Hello, i had scoliosis surgery when I was younger before as well. And I recently just gave birth to my newborn naturally without epidural.
Here are some suggestions on what I did:
1. Get an X-ray film of your scoliosis and let your gynae to advise if epidural is ok for you, as it depends on which section of the metal rod is inserted to your spine.
2. If the metal rod is inserted near to your hips, it is better not to take epidural (natural or csec) as it will be difficult to jab to the spine.
FYI, it is also not the most ideal to have General Anesthesia csec as both mother and child will be asleep, and it may pose complications.
Then again, please consult your gynae for more advice.
Wishing you a smooth delivery!
lim sharlyn