Table 4.
Incidence of revision and osteolysis by implant offset (mm).
| +0-4 | +6 | +8 (REF) | +12 | Total | |
|---|---|---|---|---|---|
| Revisions | |||||
| Revisions, N | 3 | 3 | 13 | 8 | 27 |
| Person-years | 375.0 | 675.4 | 1978.4 | 1994.6 | 5023.4 |
| Incidence ratea | 8.0 | 4.4 | 6.6 | 4.0 | 5.4 |
| Incidence rate ratio (IRR), 95% CI |
1.22 (0.35, 4.27) |
0.68 (0.19, 2.37) |
REF |
0.61 (0.25, 1.47) |
|
| Osteolysis | |||||
| Osteolysis, N | 1 | 3 | 20 | 10 | 34 |
| Person-years | 374.8 | 671.4 | 2013.7 | 1991.3 | 5051.2 |
| Incidence ratea | 2.7 | 4.5 | 9.9 | 5.0 | 6.7 |
| Incidence rate ratio (IRR), 95% CI | 0.27 (0.04, 2.00) | 0.45 (0.13, 1.51) | REF | 0.51 (0.24, 1.08) |
a
Per 1000 person-years.