Table 2.

Differences of acetabular cup position between standing and sitting according to postoperative spinopelvic mobility

	Stiff	Neutral	Hypermobile	p value1	p value2	p value3	η2
∆Cup anteversion standing–sitting ° (SD; range)	− 5.8 (5.5; − 14.7–4.8)	− 12.4 (6.6; − 41.9–7.7)	− 19.9 (6.2; − 32.4–5.0)	< 0.000	< 0.000	< 0.000	0.284
∆Cup inclination standing–sitting ° (SD; range)	− 2.3 (7.2; − 13.1–16.0)	− 11.2 (7.9; − 52.1–15.0)	− 18.8 (8.4; − 36.1–3.5)	< 0.000	< 0.000	< 0.000	0.238

Differences of acetabular cup position in anteversion and inclination between standing and sitting position according to postoperative spinopelvic mobility classification ∆PT. ∆PT < 10° were defined as stiff, ≥ 10–30° as normal and > 30° as hypermobile

SD standard deviation. ∆Cup Anteversion Standing–Sitting difference between cup anteversion in standing position and cup anteversion in sitting position depicted as Delta (∆). ∆Cup Inclination Standing–Sitting difference between cup inclination in standing position and cup inclination in sitting position depicted as Delta (∆). η² ANOVA effect size measure-Eta squared

¹p value displayed differences between groups Stiff and Neutral

²p value between groups Neutral and Hypermobile

³p value between groups Stiff and Hypermobile. Analysis of Variance (ANOVA) and post hoc analysis according to Bonferroni (due to variance homogeneity) was applied. A significance level of p < 0.05 was assumed