Can we separate acute from chronic here?
Acute LBP is going to be a lot easier to sort out than chronic as MOI should help determine what was hurt. Fall onto buttock with pain localizing at or below LS junction to one side = SIJ>disk>facet.
Whiplash with left sided neck pain to shoulder=facet
Lifting a couch to vacuum under it and a band of pain about the LS junction shows up the next day = disk.
Now let those patients have poor coping skills, let 1 year go by while they do chiro, eat McDonalds, continue smoking, watch more Springer, lose their job, smoke some weed, get a few tattoos, put on 20 pounds- and bring them back to clinic. Now they have chronic pain and I have no way of knowing where to begin except to get the complete H&P and yada yada yada. I think this is when Nik takes a puff on a cigarette and says, " Only the needle knows."