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Scatterplot of spinopelvic mobility (ΔSS) from the standing to the relaxed or straight seated position. Fifty-two patients with normal spinopelvic mobility in the relaxed seated position (ΔSSst-rs > 10°) are in the right quadrant. Twenty-four (46%) of them are classified as having a stiff spine (ΔSSst-ss < 10°) in the straight seated position (shaded area in the lower right quadrant), but they would not actually have stiff spines. ΔSSst-rs, change in sacral slope from standing to relaxed seated; ΔSSst-ss, change in sacral slope from standing to straight seated.
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