Table 4.
Differences between radiography and MRI
| Measure | MRI slice orientation | Slice name | Mean difference | SD | Minimum | Maximum |
|---|---|---|---|---|---|---|
| LCE angle | Coronal | Ant-10 mm | −0.8 | 7.4 | −29.1 | 25.1 |
| LCE angle | Coronal | Ant-5 mm | +1.1 | 5.7 | −16.3 | 19.1 |
| LCE angle | Coronal | Center | +2.1 | 6.1 | −14.3 | 25.4 |
| LCE angle | Coronal | Post-5 mm | +1.4 | 6.4 | −18.8 | 21.1 |
| Tönnis angle | Coronal | Ant-10 mm | −0.1 | 6.5 | −16.6 | 20.9 |
| Tönnis angle | Coronal | Ant-5 mm | −2.4 | 6.2 | −22.4 | 10.5 |
| Tönnis angle | Coronal | Center | −3.6 | 6.0 | −18.9 | 13.9 |
| Tönnis angle | Coronal | Post-5 mm | −3.6 | 6.1 | −17.0 | 14.2 |
| Extrusion index | Coronal | Ant-10 mm | −0.8% | 9.5% | −48.1% | 32.6% |
| Extrusion index | Coronal | Ant-5 mm | −0.3% | 6.3% | −17.5% | 17.5% |
| Extrusion index | Coronal | Center | −1.3% | 6.1% | −21.3% | 10.6% |
| Extrusion index | Coronal | Post-5 mm | −1.1% | 6.9% | −22.2% | 16.7% |
| ACE angle | Sagittal | S-Med-5 mm | +27.8 | 17.5 | −19.6 | 93.5 |
| ACE angle | Sagittal | S-Center | +27.4 | 14.1 | −17.7 | 76.7 |
| ACE angle | Sagittal | S-Lat-5 mm | +23.8 | 16.1 | −19.7 | 74.0 |
| ACE angle | 25o oblique sagittal | OS-Med-5 mm | +20.9 | 12.6 | −4.0 | 71.2 |
| ACE angle | 25o oblique sagittal | OS-Center | +13.5 | 13.0 | −24.1 | 70.7 |
| ACE angle | 25o oblique sagittal | OS-Lat-5 mm | +5.1 | 13.6 | −22.8 | 65.8 |
LCE = lateral center-edge; ACE = anterior center-edge; Ant = anterior; Post = posterior; Lat = lateral; Med = medial; S = sagittal; OS = oblique sagittal.