Surgical correction for adult spinal deformity increases acetabular lateral coverage of femoral heads

Table 5 Comparison of the change of acetabular coverage after ASD correction according to PI

	Group I (PI < 45°)	P	Group II (PI 45–60°)	P	Group III (PI > 60°)	P	Jonckheere-Terpstra test	Mann-Whitney U test
TA (°)
Right Side
Preop	9.0 ± 3.7		7.0 ± 1.8		7.9 ± 3.0		0.339	0.321
Po 1Y	7.4 ± 2.4	< 0.001*	5.5 ± 1.4	< 0.001*	5.4 ± 1.6	< 0.001*	0.044*	0.059
Left Side
Preop	9.2 ± 4.3		6.6 ± 1.7		8.1 ± 3.4		0.660	0.541
Po 1Y	7.3 ± 2.7	< 0.001*	5.2 ± 1.4	< 0.001*	5.4 ± 1.6	< 0.001*	0.108	0.093
LCEA (°)
Right Side
Preop	31.2 ± 4.3		34.1 ± 4.6		31.0 ± 4.8		0.578	0.888
Po 1Y	33.1 ± 1.6	< 0.001*	38.3 ± 5.2	< 0.001*	37.4 ± 2.9	< 0.001*	0.045*	0.002*
Left Side
Preop	32.0 ± 4.7		36.2 ± 5.4		33.2 ± 3.8		0.863	0.541
Po 1Y	35.0 ± 2.7	< 0.001*	39.4 ± 5.3	< 0.001*	38.1 ± 3.7	< 0.001*	0.174	0.139
SA (°)
Right Side
Preop	37.0 ± 1.3		37.1 ± 3.8		37.2 ± 2.5		0.878	0.888
Po 1Y	38.8 ± 1.6	< 0.001*	38.9 ± 3.8	< 0.001*	40.1 ± 2.8	< 0.001*	0.479	0.277
Left Side
Preop	36.5 ± 2.6		36.5 ± 3.9		36.4 ± 3.3		0.939	1.000
Po 1Y	40.0 ± 2.8	< 0.001*	38.6 ± 4.0	< 0.001*	39.4 ± 4.1	< 0.001*	0.619	0.743

PI Pelvic incidence, Preop Preoperative, Po 1Y 1-year postoperative, TA Tönnis angle, LCEA Lateral center edge angle, SA Angle of Sharp.
The data in the table are presented as the mean ± SD.
P, Paired-t test between Preop and Po 1Y.
Jonckheere-Terpstra test, among Group I, II and III.
Mann-Whitney U test, between Group I and Group III.
* Statistically significant if p < 0.05

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