Foot pain without pain radiating from the spine down the buttocks and posterior thigh always makes me worried about sources other than a spine origin. Yes-selective nerve root blocks (SNRB) generally will diagnose the origin of the disorder (but only in the first three hours after the block-see pain diary).
Other areas of nerve compression include the lateral knee (common peroneal nerve compression-see website) and tarsal tunnel syndrome. Generally, testing can indicate the cause (see EMG/NCV) of this nerve entrapment but “small fiber neuropathy” can cause pain and tingling without any evidence of changes on EMG/NCV.
If you have had two nerve blocks after surgery without any immediate relief (again-see pain diary), the source is not the blocked nerve as you would have had temporary relief.
You might have chronic neuropathy or peripheral neuropathy (see website). These disorders can be diagnosed but treatment is medical or related to a spinal cord stimulator. Get to an experienced neurologist who will take the time to diagnose you.
Dr. Corenman
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.