A high offset stem design does not increase stem migration under full weight bearing in cementless total hip arthroplasty: a model-based RSA study

Table 3 Comparison of stem subsidence between adjacent follow-up intervals within each group

Group	Follow-up interval	Mean of difference	95% CI of difference	P-value
SL-PLUS Lateral	Baseline vs. 6 weeks	0.73	0.12 to 1.33	0.015*
	6 weeks vs. 3 months	− 0.13	− 0.44 to 0.17	0.712
	3 months vs. 6 months	− 0.01	− 0.26 to 0.25	> 0.999
	6 months vs. 1 year	− 0.003	− 0.16 to 0.16	> 0.999
	1 year vs. 2 years	− 0.05	− 0.21 to 0.12	0.927
SL-PLUS Standard	Baseline vs. 6 weeks	0.41	− 0.29 to 1.11	0.439
	6 weeks vs. 3 months	0.08	− 0.20 to 0.36	0.942
	3 months vs. 6 months	0.05	− 0.07 to 0.18	0.739
	6 months vs. 1 year	− 0.09	− 0.34 to 0.15	0.824
	1 year vs. 2 years	− 0.04	− 0.27 to 0.18	0.987
*P < 0.05

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