First-read the EMG/NCV section on the website to understand what this test can and cannot discern. You will find that pain and numbness will not be detected by this test so the information generally is not helpful in your case. The dive bomber sound is typically associated with myoclonus which is most likely what you have with your muscle disorder. This condition generally does not cause typical neck or shoulder pain.
To determine what is causing pain, diagnostic injections may be the key in your case. Is your shoulder causing more pain than your neck? An injection of lidocaine into the shoulder will give you some relief depending upon how much pain is generated by the shoulder. If you have minimal relief, then it is likely that the shoulder is not causing pain. I will say that neurosurgeons generally do not have the ability to examine the shoulder and determine if there is a shoulder problem. Orthopaedic surgeons are the ones who can determine that disorder.
Diagnostic blocks of nerve roots (SNRB), facets (facet blocks) or even discograms could be used to workup your neck and shoulder pain to determine where the pain is generated.
Again, the D-trax surgery for a pseudoarthrosis is not the best procedure to repair this lack of fusion so I am not sad that this surgery was cancelled.
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.