What is risk of having an epidural after having a spinal fracture stabilized with titanium?

Epidural. Same as having a regular epidural. Having the fusion does not put you at greater risk.
Varies. This depends on if the fracture is near where the epidural is being placed. Previous spine surgery can make epidural placement difficult, may affect how the local anesthetic spreads, and may increase the risk of a wet tap (when the epidural needle inadvertently enters the spinal fluid).