Validation of a preoperative formula to estimate postoperative pelvic sagittal alignment and mobility before performing total hip arthroplasty for patients with hip osteoarthritis

Table 3 Multiple linear regression analysis of postoperative SS in standing

	Unstandardized coefficient		Standard coefficient	P value	95% CI
	B	SE	β
Post SS-standing
Constant	14.836	4.678		0.002	5.528 – 24.143
Pre SS-standing	0.764	0.058	0.764	0.000	0.648 – 0.879
Pre SS-sitting	0.123	0.043	0.158	0.006	0.037 – 0.209
Age	-0.154	0.056	-0.141	0.007	-0.265 – -0.043
Postoperative SS-standing = 14.836 + preoperative SS-standing×0.764 + preoperative SS-sitting×0.123 – age×0.154 (R² = 0.810).
Post SS-sitting
Constant	-0.703	3.206		0.827	-7.083 – 5.676
Pre SS-sitting	0.612	0.074	0.618	0.000	0.465 – 0.760
Pre SS-standing	0.335	0.093	0.264	0.001	0.150 -– 0.519
The present of contralateral hip OA	-4.729	1.868	-0.166	0.013	-8.446 – -1.012
Postoperative SS-sitting = -0.703 + preoperative SS-standing×0.335 + preoperative SS-sitting×0.612 – the presence of contralateral hip OA×4.729 (R² = 0.672).
Post ΔSS
Constant	6.253	3.873		0.110	-1.455– 13.961
Pre SS-standing	0.436	0.108	0.402	0.000	0.221– 0.651
Pre SS-sitting	-0.491	0.085	-0.580	0.000	-0.660 – -0.323
The present of contralateral hip OA	5.639	2.167	0.232	0.011	1.327 – 9.951
The present of scoliosis	-4.548	2.211	-0.180	0.043	-8.949 – -0.148
Postoperative ΔSS = 6.253 + preoperative SS-standing×0.436 − preoperative SS-sitting×0.491 + the presence of contralateral hip OA×5.639 – the present of scoliosis×4.548 (R² = 0.423)

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