Table 6.

Revision ratios (RRs) with 95% confidence intervals (CIs) in 6 HRA devices compared to the uncemented reference THA. Data are based on a Cox regression model at different follow-up time intervals (the first year, the second and third years, and from the fourth year onwards)

	Follow-up interval: 1st year		Follow-up interval: 2nd and 3rd year		Follow-up: from 4th year onwards
	RR	95% CI for RR	p-value	RR	95% CI for RR	p-value	RR	95% CI for RR	p-value
Reference THA	1			1			1
BHR	0.48	0.32–0.70	0.0002	0.83	0.54–1.26	0.4	1.66	1.31–2.11	< 0.001
Cormet	0.67	0.17–2.70	0.6	1.84	0.58–5.81	0.3	2.06	1.02–4.18	0.04
ASR	0.58	0.36–0.94	0.03	1.85	1.24–2.77	0.003	9.18	7.44–11.31	< 0.001
ReCap	0.64	0.38–1.07	0.09	0.82	0.44–1.53	0.5	2.30	1.55–3.42	< 0.001
Durom	0.58	0.26–1.31	0.2	1.44	0.70–2.95	0.3	1.15	0.59–2.25	0.7
Conserve Plus	1.00	0.61–1.64	1.0	0.78	0.36–1.68	0.5	1.78	1.03–3.08	0.04