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Sagittal facet slope and slipped disc angle. We measured the facet slope, which combines both the disc slope and facet angle of the slipped vertebrae. The facet slope was defined as the angle between the line drawn on the facet joint and the horizontal line in the lateral view of a simple X-ray (solid line). Slipped disc angle was defined as Cobb angle at slipped intervertebral space (dotted line).
