Hi,
Maybe this is a topic for another forum, but since you asked I am happy to give a short explaination. It probably does sound a little bewildering.
The force of contractions during the second stage of labor can (not always) bring the baby low enough to safely deliver the baby with the help of a vacuum extractor or sometimes forceps. There are more than a few reasons why patients can't or won't push. Just like AN surgery, the experience of the OB can be a variable as well as the size of the baby in relation to the pelvis. (There are many other variables.) With any pregnancy, a C/S is always a possibility and not being able to push increases the possibility but doesn't guarantee it.
I don't know if pushing is contraindicated post AN surgery. I think it would be the call of the neuro team. If it is OK from the neuro point of view, it should be OK from the OB standpoint. Keep us posted!
Janet