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The rib-vertebral angle (RVA) is formed between the longitudinal axis of the apical thoracic vertebra and corresponding rib on the convex and concave sides of the curve. A perpendicular line is drawn at the midpoint of the lower endplate of the apical vertebra. Another line is drawn from the midpoint of the head to the midpoint of the neck of the rib. The rib line is extended medially to intersect with the perpendicular line to make the RVA.
