The most common explanation for spina bifida seems to be folate deficiency in the early parts of pregnancy. It seems that since it's not a truly genetic malformation that it should be reversible. The late Travis had writings in spina bifida and neural tube defects but I'm not seeing many options after it has already taken place. Surgery seems to be the go to, I'm thinking there must be things that can help, especially at a young age, to reverse the condition naturally. Hernias are also said to be non reversible unless by surgery but I have heard of people reversing them.