Table 2.
Probability of reoperation and causes of failure after primary TKA
| Reasons for revision | Group 1 | Group 2 | Group 3 |
|---|---|---|---|
| (N = 126) | (N = 115) | (N = 106) | |
| Femoral fracture | 2 (1.6%) | 0 (0%) | 0 (0%) |
| Femoral loosening | 2 (1.6%) | 0 (0%) | 0 (0%) |
| Tibial loosening | 4 (3.1%) | 0 (0%) | 0 (0%) |
| Instability | 1 (0.8%) | 4 (3.5%) | 1 (0.9%) |
| Deep infection | 0 (0%) | 2 (1.7%) | 2 (1.9%) |
| Total | 6 (4.7%) | 4 (3.5%) | 3 (2.8%) |
Group 1 = traditional cemented modular tibia; Group 2 = cemented nonmodular highly porous tibia (as per original FDA approval); Group 3 = uncemented nonmodular highly porous tibia.