I have heard the term, but am unsure exactly what it referring to. Possibly loose bodies in the facet joints, or fragments of disc moving about causing problems. It is certainly not a 'syndrome' or a recognised pathological entity as far as I know
Maybe it is the time to look further, why just low back pain has to be located in certain tissues: bones, tendons, ligaments, muscles...🤨 there is plenty of fatty tissue in the body, and all the sensitive nerves are surrounded by it🧐!
Pain by compression can be at any level of the nerve.
Lumbar fatty tissue in subcutaneous tissues is rarely, if ever a source of back pain. You can find sensitive spots, certainly, especially if you go hunting for them. Some call these trigger points, but think these are muscle issues rather than fat. A systematic review is not really supportive of this approach (see https://www.archives-pmr.org/article/S0003-9993(01)06656-4/fulltext ).
Fat is not sensitive actually, we know that because there have been studies where conscious patients have had surgery under progressive local anaesthesia (see Article The tissue origin of low back pain and sciatica: A report of...
) and at least in this subgroup, fat simply doesn't hurt.
We used to pay a lot of attention to the subcutaneous tissues with massage, but there isn't much support (see Article Massage for Low Back Pain: An Updated Systematic Review With...
and
Article Massage for low back pain
) The evidence is of low quality anyway.
Low back pain is non-specific before the patient's history is taken and the physical examination. There are clinical reasoning methods that reduce the size of the diagnostic problem. I have posted two videos on YouTube about this. One to help clinicians (see https://www.youtube.com/watch?v=p0xM90nr4i0 ), and the other is a tongue-in-cheek lecture for a more general population (see https://www.youtube.com/watch?v=ofJqQjMjq9g )