Table 2.
Relative risk of revision for infection according to sex, age, diagnosis, year of surgery, and type of fixation, calculated using Cox regression analysis
| No. of revisions | RR | 95% CI | p-value | |
|---|---|---|---|---|
| Age | 2,315 | 1.0 | 0.99–1.01 | 0.1 |
| Sex | ||||
| Female | 1,044 | 1 (ref.) | ||
| Male | 1,271 | 1.9 | 1.8–2.1 | < 0.001 |
| Diagnosis | ||||
| OA | 2,228 | 1 (ref.) | ||
| RA | 87 | 1.3 | 1.0–1.6 | 0.04 |
| Year of primary surgery | ||||
| 1995–2001 | 858 | 1 (ref.) | ||
| 2002–2010 | 1,457 | 1.4 | 1.3–1.5 | < 0.001 |
| Fixation | ||||
| AB+ cement a | 1,632 | 1 (ref.) | ||
| Uncemented | 490 | 0.9 | 0.8–1.0 | 0.1 |
| AB– cement a | 193 | 1.4 | 1.2–1.6 | < 0.001 |
a
AB+ cement: antibiotic-loaded cement. AB– cement: cement without antibiotics.