Table 4.

Cox regression results for reverse hybrid brand combinations compared to cemented THAs, with adjustment for age, sex, period, and diagnosis. The endpoint was any revision. Median follow-up was calculated by "reverse Kaplan-Meier"

Prosthesis cup/stem	Total n	Revised n	RR	95% CI	p-value	Median follow-up (IQR)
Cemented THA	267,755	9,975	1			6.2 (3.2–9.3)
Elite/Corail	3,346	107	0.8	0.7–1.0	0.05	5.3 (3.5–6.8)
Titan/Corail	904	45	1.2	0.9–1.7	0.2	5.6 (4.1–8.6)
Kronos/Corail	632	22	0.9	0.6–1.3	0.5	5.5 (4.3–6.9)
Reflection all-poly/Corail	1,183	60	1.3	1.0–1.7	0.05	5.2 (4.1–7.2)
Contemporary/Corail	902	20	0.7	0.5–1.1	0.1	4.0 (2.9–5.2)
Marathon/Corail	8,856	202	1.3	1.2–1.5	< 0.001	1.6 (0.8–2.6)
Lubinus/Spotorno	515	10	0.6	0.3–1.0	0.06	5.1 (3.1–6.3)
Lubinus/Corail	1,932	54	1.2	0.9–1.5	0.3	3.1 (1.8–4.3)
Contemporary/ABG II HA	646	32	1.4	1.0–1.9	0.08	5.0 (3.9–6.8)

IQR: interquartile range.