Table 2.
Component orientation (in degrees) determined radiographically with subgroups for manufacturer and design changes
| Design | Femoral varus-valgus | Tibial angle | Femoral flexion-extension | Tibial posterior slope |
|---|---|---|---|---|
| IB PS I | 10.9 valgus ± 12° | −1.7 varus ± 5.8° | 1.3 flexion ± 7.4° | 2.5 ± 6.7° |
| Zimmer (n = 39) | 7.6 valgus ± 6°* | −1.6 varus ± 3.2° | 0.3 flexion ± 5.8° | 1.2 ± 4.1° |
| Johnson & Johnson (n = 7) | 20.7 valgus ± 19°* | −2.1 varus ± 10.7° | 4.3 flexion ± 11.3° | 1.2 ± 4.1° |
| IB PS II | 7.1 valgus ± 5.4° | −0.7 varus ± 3.3° | 2.2 flexion ± 6° | 0.3 ± 1.6° |
| Original | 8.3 valgus ± 5.3° | −0.7 varus ± 3.8° | 3.3 flexion ± 5.3° | 0.1 ± 0.5° |
| Modified | 6.7 valgus ± 5.4° | −0.7 varus ± 3.2° | 1.9 flexion ± 5.1° | 0.4 ± 1.8° |
*Within subgroups, the only significant difference was in femoral varus-valgus angle between the Zimmer and Johnson & Johnson IB PS I components.