I would think that maybe a new set of eyes would be appropriate to look at the history, physical examination, images and results of current diagnostic testing.
If the block is going to be repeated at a very different spot in the spine that has been spotted as a possible source of pain (nerve compression), then maybe the block might be diagnostically helpful. If however, the block is in the same general vicinity as the initial epidural injection, why would you expect a different response than the initial failed injection?
Donald Corenman, MD, DC is a highly-regarded spine surgeon, considered an expert in the area of neck and back pain. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books.