Epidural Contrast Flow Patterns of TESI Using the Inferior-Anterior Position as the Final Needle Tip Position.

The purpose of this study is to describe the contrast flow patterns in the epidural space
using the inferior-anterior approach with continuous fluoroscopic guidance, and determine how
well this approach correlates with appropriate contrast flow patterns and with analgesia at
follow up. This knowledge may prove useful in guiding physician practice patterns in the
non-surgical management of low back pain.

Hypothesis: The investigators hypothesize that there will be suitable (ventral/anterior)
epidural contrast spread based on inferior-anterior needle-tip position, particularly with
appropriate needle tip position.