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Comparison of ability to identify translational instability between Si-Su and F-E
| Si-Su | F-E | Total | |
| Translational motion ≥ 8% (translational instability) | Translational motion < 8% | ||
| Translational motion ≥ 8% (translational instability) | 10 | 28 | 38 |
| Translational motion < 8% | 2 | 22 | 24 |
| Total | 12 | 50 | 62 |
Si-Su = the combination of the natural sitting radiograph and the supine MRI; F-E = the combination of the standing flexion radiograph and the standing extension radiograph.
