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 2

Correlations with the change in sacral slope from the straight to the relaxed seated position (ΔSS_ss-rs).

		Correlation coefficient (r)^*	p-value^*
Age		−0.19	0.09
BMI		−0.15	0.19
Standing position
	SS	0.09	0.45
	PI	0.03	0.78
	LLA	−0.01	0.94
	PFA	−0.02	0.86
Relaxed seated position
	SS	−0.52	<0.001
	LLA	−0.39	<0.001
	PFA	0.37	0.001
Straight seated position
	SS	0.13	0.26
	LLA	0.03	0.79
	PFA	0.02	0.85
ΔLLA_ss-rs		0.79	<0.001
ΔPFA_ss-rs		−0.76	<0.001

Spearman’s rank correlation.

ΔSS_ss-rs was significantly correlated with the spinopelvic sagittal alignment parameters (i.e., SS, LLA, and PFA) in the relaxed seated position, ΔLLA_ss-rs, and ΔPFA_ss-rs.

SS, sacral slope; PI, pelvic incidence; LLA, lumbar lordotic angle; PFA, pelvic-femoral angle; BMI, body mass index; ΔSS_ss-rs, change in sacral slope from the straight to the relaxed seated position; ΔLLA_ss-rs, change in lumbar lordotic angle from the straight to the relaxed seated position; ΔPFA_ss-rs, change in pelvic-femoral angle from the straight to the relaxed seated position.

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