Table 2.

Comparison of reverse hybrid THAs and cemented THAs in corresponding age groups regarding risk of revision. Cemented THAs were defined as 1 when calculating RR. Cox analysis was used, with adjustment for gender, primary diagnosis, and period

Age group	RRa	CI (95%)	p-value
< 55 years
All revisions	0.9	0.8–1.0	0.07
Fracture	1.4	0.8–2.5	0.3
Infection	0.7	0.5–1.1	0.08
Loosening	0.9	0.7–1.1	0.2
Dislocation	0.8	0.5–1.1	0.2
55–64 years
All revisions	1.1	1.0–1.3	0.013
Fracture	3.1	2.2–4.5	<0.001
Infection	1.1	0.8–1.4	0.7
Loosening	1.1	0.9–1.3	0.5
Dislocation	0.8	0.6–1.0	0.1
65–74 years
All revisions	1.5	1.3–1.7	<0.001
Fracture	4.0	2.9–5.3	<0.001
Infection	1.1	0.9–1.3	0.6
Loosening	1.6	1.4–2.0	<0.001
Dislocation	0.8	0.6–1.0	0.08
> 74 years
All revisions	2.0	1.8–2.3	<0.001
Fracture	5.8	4.3–7.9	<0.001
Infection	1.7	1.3–2.1	<0.001
Loosening	2.6	2.0–3.5	<0.001
Dislocation	1.2	0.9–1.6	0.2

^aCemented THA same age group =1