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The curvature of the spine is measured by placing a flexicurve ruler along the participant’s spine and measuring the curve from C7 to the lumbosacral junction (represented here by LS). A horizontal line is then drawn from C7 to LS, and the height and width of the thoracic portion of the curve is measured. The kyphosis index (KI) is calculated by dividing the thoracic height by the thoracic width and multiplying the result by 100 (KI = (H/W)*100).
