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Compared the AI between the dislocated hips and unaffected hips in the group of grade II, III and IV according to the classification of Tönnis
| Tönnis grade | Dislocated hips | Unaffected hips | P-value | ||
|---|---|---|---|---|---|
| Mean±SD | Range | Mean±SD | Range | ||
| II | 33.36 ± 3.70° | (29–41°) | 22.21 ± 1.70° | (19–25°) | 0.001 |
| III | 32.79 ± 5.17° | (22–45°) | 21.22 ± 4.28° | (14–28°) | 0.001 |
| IV | 34.21 ± 4.15° | (28–42°) | 21.54 ± 2.64° | (16–25°) | 0.001 |
AI acetabular index, SD standard deviation
