Facet syndrome (also commonly known as facet joint disease, facet osteoarthritis, facet hypertrophy or facet arthritis) is a syndrome in which the facet joints (synovial diarthroses, from C2 to S1) degenerate to the point of causing painful symptoms.[1] In conjunction with degenerative disc disease, a distinct but functionally related condition, facet syndrome is believed to be one of the most common causes of lower back pain.[2][3]