Table 4.
Computer navigation and computed tomography values with cup at 35° of inclination
| Tilt | Real anteversion (°) | Measurement of inclination (°) | Measurement of anteversion (°) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Anatomic | Radiographic | Anatomic | Radiographic | ||||||
| PT | PT* | MONT | CN | PT | PT* | MONT | CN | ||
| No tilt | 0 | 35 | 35.0 | 35.2 | 35.3 | 0 | 0.0 | 0.1 | −0.3 |
| 10 | 36 | 35.5 | 34.6 | 34.7 | 11 | 6.4 | 6 | 6.3 | |
| 20 | 35 | 33.3 | 33.6 | 33.0 | 20 | 11.3 | 11.2 | 12.0 | |
| 30 | 35 | 31.2 | 31 | 31.3 | 30 | 16.7 | 16.5 | 17.0 | |
| 40 | 35 | 27.9 | 28.2 | 28.3 | 41 | 22.1 | 21.3 | 21.7 | |
| 50 | 35 | 24.2 | 23.8 | 24.0 | 50 | 26.1 | 26 | 26.3 | |
| Posterior pelvic tilt 6° | 0 | 35 | 35.0 | 35 | 34.3 | 0 | 0.0 | 0 | 0.3 |
| 10 | 35 | 34.5 | 34.5 | 34.0 | 11 | 6.3 | 5.9 | 6.0 | |
| 20 | 35 | 33.3 | 33.8 | 33.3 | 20 | 11.3 | 11.5 | 11.3 | |
| 30 | 35 | 31.0 | 31.5 | 31.0 | 31 | 17.2 | 16.4 | 16.3 | |
| 40 | 35 | 27.9 | 28.5 | 27.3 | 41 | 22.1 | 22 | 22.0 | |
| 50 | 36 | 25.0 | 24.5 | 24.0 | 50 | 26.8 | 26.4 | 26.3 | |
| Anterior pelvic tilt 6° | 0 | 35 | 35.0 | 34.5 | 34.3 | 0 | 0.0 | 0.1 | 0.7 |
| 10 | 35 | 34.6 | 34.2 | 34.7 | 10 | 5.7 | 5.7 | 5.7 | |
| 20 | 35 | 33.3 | 33.4 | 33.7 | 20 | 11.3 | 11.2 | 11.0 | |
| 30 | 35 | 31.0 | 31 | 31.3 | 31 | 17.2 | 16.5 | 16.3 | |
| 40 | 35 | 28.2 | 28.5 | 29.7 | 40 | 21.6 | 21.5 | 22.0 | |
| 50 | 35 | 24.2 | 24.3 | 24.3 | 50 | 26.1 | 26 | 26.3 | |
* These values were calculated from the anatomic values from HipNav™; PT = HipNav™; MONT = Navitrack®; CN = computer navigation.