Peri-prosthetic bone remodeling of hydroxyapatite-coated compaction short stem was not affected by stem alignment

Table 4 Relation between stem absolute anteversion error and BMD change at 24 months post-operatively in the Gruen zones

	Outlier versus non-outlier (absolute anteversion error)
	HA full compaction					Tapered wedge
	Outlier (n = 24)	Non-outlier (n = 35)	p value	Effect size (Cohen’s d)	95% CI	Outlier (n = 28)	Non-outlier (n = 28)	p value	Effect size (Cohen’s d)	95% CI
Zone1	0.92 ± 0.11	0.90 ± 0.16	0.287	− 0.14	− 0.67 to 0.39	0.89 ± 0.11	0.96 ± 0.11	0.022*	0.64	0.10–1.17
Zone2	0.92 ± 0.12	0.90 ± 0.11	0.369	− 0.18	− 0.71 to 0.36	0.98 ± 0.10	1.00 ± 0.14	0.249	0.16	− 0.36 to 0.69
Zone3	1.01 ± 0.05	1.02 ± 0.06	0.937	0.18	− 0.34 to 0.70	1.03 ± 0.08	1.04 ± 0.10	0.571	0.11	− 0.41 to 0.64
Zone4	1.03 ± 0.04	1.05 ± 0.06	0.267	0.38	− 0.15 to 0.90	1.01 ± 0.05	1.02 ± 0.05	0.265	0.20	− 0.33 to 0.73
Zone5	1.01 ± 0.07	1.06 ± 0.09	0.105	0.61	0.08–1.14	1.04 ± 0.16	1.05 ± 0.14	0.653	0.07	− 0.46 to 0.59
Zone6	0.95 ± 0.15	0.96 ± 0.14	0.275	0.07	− 0.45 to 0.60	0.98 ± 0.11	1.04 ± 0.16	0.154	0.44	− 0.09 to 0.97
Zone7	0.82 ± 0.22	0.81 ± 0.19	0.930	− 0.05	− 0.57 to 0.47	0.79 ± 0.13	0.89 ± 0.17	0.048*	0.66	0.12–1.20

ISSN: 1749-799X