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Uncovertebral joint. (a) Normal uncovertebral joint. The joint (arrow) is formed by uncinate processes above and below. (b) Uncovertebral arthrosis. Degenerative changes involving uncovertebral joints lead to uncovertebral arthrosis (arrow). (c) Hypertrophic uncovertebral arthrosis. Hypertrophic degenerative changes in the uncovertebral joint may result in foramen transversarium narrowing (arrow) and even vertebral artery compromise
