Is there a cure for spina bifida that restores nerves to the congenital defect?

Nope.: All interventions for open neural tube defects aim at preventing further neuronal loss and cannot restore damage already done. That is why fetal interventions can prove a major breakthrough in prenatally diagnosed cases: the fetal neuronal plasticity and ability to regenerate damaged tissues is such that a much better long-term outcome can be achieved. http://women.texaschildrens.org/fetalcenter/.