Table 2.
Life table for total knee arthroplasty failures requiring revision
| Interval (years) | Number | Failures | Lost | Withdrawn | At risk | Failure rate (%) | Cumulative survival (%) | 95% CI | |
|---|---|---|---|---|---|---|---|---|---|
| Lower limit | Upper limit | ||||||||
| 0–1 | 462 | 2 | 1 | 7 | 458 | 0.4 | 99.6 | 99.0 | 100 |
| 1–2 | 452 | 1 | 0 | 4 | 450 | 0.2 | 99.4 | 99.0 | 99.8 |
| 2–3 | 447 | 0 | 1 | 5 | 444 | 0 | 99.4 | 99.0 | 99.8 |
| 3–4 | 441 | 0 | 0 | 5 | 438 | 0 | 99.4 | 99.0 | 99.8 |
| 4–5 | 436 | 1 | 2 | 15 | 427 | 0.2 | 99.2 | 98.8 | 99.6 |
| 5–6 | 418 | 2 | 0 | 12 | 412 | 0.5 | 98.7 | 98.1 | 99.3 |
| 6–7 | 404 | 0 | 2 | 14 | 396 | 0 | 98.7 | 98.1 | 99.3 |
| 7–8 | 388 | 0 | 1 | 12 | 381 | 0 | 98.7 | 98.1 | 99.3 |
| 8–9 | 375 | 1 | 1 | 21 | 364 | 0.3 | 98.4 | 97.8 | 99.0 |
| 9–10 | 352 | 1 | 0 | 23 | 340 | 0.3 | 98.1 | 97.5 | 98.7 |
| 10–11 | 328 | 0 | 0 | 213 | 221 | 0 | 98.1 | 97.5 | 98.7 |
| > 11 | 115 | 0 | 0 | 115 | 57 | 0 | 98.1 | 97.5 | 98.7 |
CI confidence interval