According to the medical dictionary arthropathy is "disease of the joint." The facets are those "wing-like" bony structures on each side of the spine, going all the way down your spine. If you hunch your back, you can feel them.
So according to this, you have diseased facet joints. There are no discs in the facet area so there's no herniations.
I honestly don't know what can be done for this -- I am ASSUMING that it is probably something like osteoarthritis, but I could be VERY WRONG. You would have to ask your doctor.
I wish I could help you more. Best of luck and God bless. Hugs, Lee