Table 5.
Risk factors for rerevision of the cup or liner as a result of any reason versus dislocation, comparison between liner exchange and uncemented with uncemented cup revision (Cox regression analysis)
| Risk factor | Rerevision, all causes | Rerevision as a result of dislocation | ||||
|---|---|---|---|---|---|---|
| RR | 95% CI | p value | RR | 95% CI | p value | |
| Sex | ||||||
| Female* | 1 | 1 | ||||
| Male | 1.06 | 0.84–1.33 | 0.64 | 0.93 | 0.57–1.53 | 0.78 |
| Age (years) | ||||||
| 0–49 | 2.52 | 1.48–4.31 | 0.001 | 1.75 | 0.67–4.57 | 0.25 |
| 50–59 | 2.21 | 1.34–3.66 | 0.002 | 1.35 | 0.57–3.24 | 0.50 |
| 60–69 | 1.66 | 1.00–2.75 | 0.05 | 1.24 | 0.53–2.90 | 0.61 |
| 70–79* | 1 | 1 | ||||
| 80+ | 1.90 | 0.44–8.2 | 0.39 | 2.32 | 0.28–18.9 | 0.43 |
| Primary diagnosis | ||||||
| Primary osteoarthritis* | 1 | 1 | ||||
| Secondary osteoarthritis† | 0.90 | 0.70–1.17 | 0.43 | 0.79 | 0.44–1.41 | 0.43 |
| Components revised at index revision | ||||||
| Cup/liner + stem* | 1 | 1 | ||||
| Cup/liner | 1.65 | 1.29–2.12 | < 0.001 | 2.86 | 1.55–5.29 | < 0.001 |
| Components revised at index revision | ||||||
| Cup* | 1 | 1 | ||||
| Liner | 1.70 | 1.34–2.14 | < 0.001 | 2.94 | 1.72–5.03 | < 0.001 |
* Reference; †primary osteoarthritis (68%), sequelae after childhood disease (15%), inflammatory hip disease (8%), avascular necrosis (5%), fracture (3%), and others (1%); RR = relative risk; CI = confidence interval.