Measurement of spinopelvic sagittal alignment in the relaxed seated position rather than in the straight seated position is suitable for assessing spinopelvic mobility in patients before total hip arthroplasty

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Table 1

Spinopelvic sagittal alignment parameters in each position and comparison of each parameter between the relaxed and straight seated positions.

	Standing position	Relaxed seated position	Straight seated position	p-value ^†
Sacral slope (°)	35.5 ± 10.3 (−8.0 to 57.8)	18.1 ± 12.9 (−29.2 to 44)	26.5 ± 11.9 (−26.7 to 49.5)	<0.001^*
Pelvic tilt (°)	20.8 ± 9.3 (−8.0 to 57.8)	39.0 ± 12.9 (16.1–74.5)	30.7 ± 11.6 (8.8–68.9)	<0.001^*
Pelvic incidence (°)	56.3 ± 11.0 (−32.1 to 81.8)	N/A	N/A	N/A
Lumbar lordotic angle (°)	39.4 ± 17.5 (−37.7 to 73.7)	19.5 ± 16.3 (−35 to 55.5)	29.5 ± 15.9 (−37.5 to 62.2)	<0.001^**
Pelvic-femoral angle (°)	189.9 ± 12.1 (161.8–216.8)	141.0 ± 15.8 (110.1–190.4)	132.7 ± 15.1 (99.8–189.6)	<0.001^**

All values are represented as mean ± standard deviation (range).

^†

Comparison of spinopelvic sagittal alignment parameters between the relaxed and straight seated positions.

Wilcoxon signed-rank test.

^**

Paired t-test.

N/A, not applicable.

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