The lateral base lines are drawn from the inferior epiphyseal plates of each vertebra. The lines should converge of the posterior side of the lateral spine view at a central point. This is a qualitative analysis used to assist the physician in determining fixed flexion or fixed extension of vertebra(e). When a base line intersects with the next superior base line, this indicates fixed flexion of the inferior vertebra(e) while a base line intersecting with the next inferior vertebra indicates fixed extension of the superior vertebra. This leads to biomechanical dysfunction with concomitant early degenerative changes.

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