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

Table 2 Relation between stem valgus alignment and BMD change at 24 months post-operatively in the Gruen zones

	Outlier versus non-outlier (valgus alignment)
	HA full compaction					Tapered wedge
	Outlier (n = 27)	Non-outlier (n = 32)	p value	Effect size (Cohen’s d)	95% CI	Outlier (n = 9)	Non-outlier (n = 47)	p value	Effect size (Cohen’s d)	95% CI
Zone1	0.90 ± 0.17	0.92 ± 0.09	0.141	0.15	− 0.36 to 0.66	0.92 ± 0.12	0.90 ± 0.14	0.315	− 0.15	− 0.86 to 0.57
Zone2	0.92 ± 0.14	0.90 ± 0.09	0.159	− 0.17	− 0.69 to 0.34	0.90 ± 0.18	1.00 ± 0.10	0.014*	0.87	0.14–1.60
Zone3	1.02 ± 0.07	1.00 ± 0.03	0.084	− 0.38	− 0.9 to 0.134	1.01 ± 0.13	1.02 ± 0.18	0.805	0.06	− 0.66 to 0.77
Zone4	1.04 ± 0.07	1.04 ± 0.04	0.382	0.00	− 0.51 to 0.51	1.05 ± 0.06	1.01 ± 0.05	0.054	− 0.78	− 1.5 to − 0.05
Zone5	1.05 ± 0.10	1.03 ± 0.03	0.505	− 0.28	− 0.80 to 0.23	1.02 ± 0.16	1.05 ± 0.12	0.825	0.24	− 0.48 to 0.95
Zone6	0.93 ± 0.15	0.98 ± 0.14	0.421	0.35	− 0.17 to 0.86	0.97 ± 0.15	1.01 ± 0.13	0.594	0.30	− 0.42 to 1.02
Zone7	0.82 ± 0.16	0.81 ± 0.24	0.979	− 0.05	− 0.56 to 0.46	0.84 ± 0.19	0.83 ± 0.15	0.948	− 0.06	− 0.78 to 0.65

ISSN: 1749-799X