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Facet is a noun.
The facet joints are located in the spinal canal. Bilateral facet arthropathy is arthritis in the facet joints of the back.
Let's consider this issue from another facet.
In anatomy, a facet is a classification of bones according to their bone surface features. A facet is a small, flat, articular surface.
Facet hypertrophy is an enlargement of the facet and ligament joint. Nerves in the spine can come under pressure if it increases.