Facet arthritis is a syndrome of the small zygapophysial joints or synovial joints from the cervical to lumbar region and are one of the root causes of localized or axial back or neck pain. The facet joints are well lubricated and allow for nearly 20% rotation in the lumbar and cervical region. They are also well innervated by small medial branch nerves that carry pain signals, often manifesting in back pain or spasm.
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