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Use of ultrasonography for diagnosis by age category.
| Ultrasonography | 0–6 months N = 34 |
6–12 months N = 23 |
|---|---|---|
| Graf classification | 34 (100%) | 23 (100%) |
| The percentage of the femoral head coverage of the acetabulum | 12 (35%) | 13 (39%) |
| The thickness of the cartilage of the acetabulum | 3 (9%) | 2 (9%) |
| Three-dimensional ultrasonography | 1 (3%) | 1 (4%) |
