I just did a brief google search and it appears that your internist is correct when he says that the CT scan is more accurate and is less prone to distortion by DDD and scoliosis because it only looks at trabecular bone. Did you also have DEXA of the spine and if so, was there a significant difference between the DEXA and CT scores?
My DEXA scores indicate no problem with the spine but osteopenia in the hip, so I am showing a similar pattern. I do wonder whether there might be some distortion elevating the DEXA spine scores but I really think it's just a hip issue.
BTW, in my brief search, I found a research article which concluded by recommending cervical spine CT bone density evaluation of endplates prior to implantation of hardware (fusion or ADR)....hmm...
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