Table 2.
Reasons for revision of the three pairs of cohorts were represented as incidence, percentage, and distribution of failures
| Reasons for revision | Apta (1984) |
Apta-fix (629) |
Hydra (1671) |
Hydra-fix (691) |
Recta (662) |
Recta-fix (152) |
||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| N | Incidence (%) | Frequency of failure (%) | N | Incidence (%) | Frequency of failure (%) | N | Incidence (%) | Frequency of failure (%) | N | Incidence (%) | Frequency of failure (%) | N | Incidence (%) | Frequency of failure (%) | N | Incidence (%) | Frequency of failure (%) | |
| Pain without loosening | 0 | 0 | 0 | 1 | 0.2 | 7.1 | 3 | 0.2 | 10.7 | 0 | 0 | 0 | 3 | 0.5 | 17.6 | 0 | 0 | 0 |
| Periprosthetic fracture | 5 | 0.3 | 18.5 | 5 | 0.8 | 35.7 | 7 | 0.4 | 25 | 3 | 0.4 | 25 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dislocation | 8 | 0.4 | 29.6 | 0 | 0 | 0 | 2 | 0.1 | 7.1 | 1 | 0.1 | 8.3 | 3 | 0.5 | 17.6 | 1 | 0.7 | 20 |
| Cup aseptic loosening | 3 | 0.2 | 11.1 | 1 | 0.2 | 7.1 | 2 | 0.1 | 7.1 | 0 | 0 | 0 | 3 | 0.5 | 17.6 | 0 | 0 | 0 |
| Global aseptic loosening | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0.7 | 20 |
| Stem aseptic loosening | 1 | 0.1 | 3.7 | 1 | 0.2 | 7.1 | 3 | 0.2 | 10.7 | 1 | 0.1 | 8.3 | 1 | 0.2 | 5.9 | 0 | 0 | 0 |
| Infection | 2 | 0.1 | 7.4 | 1 | 0.2 | 7.1 | 2 | 0.1 | 7.1 | 1 | 0.1 | 8.3 | 0 | 0 | 0 | 0 | 0 | 0 |
| Unknown | 1 | 0.1 | 3.7 | 1 | 0.2 | 7.1 | 4 | 0.2 | 14.3 | 1 | 0.1 | 8.3 | 1 | 0.2 | 5.9 | 1 | 0.7 | 20 |
| Ossifications | 2 | 0.1 | 7.4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0.2 | 5.9 | 0 | 0 | 0 |
| Primary instability | 2 | 0.1 | 7.4 | 1 | 0.2 | 7.1 | 1 | 0.1 | 3.6 | 2 | 0.3 | 16.7 | 3 | 0.5 | 17.6 | 0 | 0 | 0 |
| Neck breakage | 2 | 0.1 | 7.4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0.2 | 5.9 | 0 | 0 | 0 |
| Liner breakage | 1 | 0.1 | 3.7 | 0 | 0 | 0 | 3 | 0.2 | 10.7 | 1 | 0.1 | 8.3 | 0 | 0 | 0 | 1 | 0.7 | 20 |
| Stem breakage | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0.1 | 3.6 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0.7 | 20 |
| Total | 27 | 1.4 | 100 | 14 | 2.2 | 100 | 28 | 1.7 | 100 | 12 | 1.7 | 100 | 17 | 2.6 | 100 | 5 | 3.3 | 100 |