Table 3 Angulation information obtained by ultrasonography
| Â | Number of views |
|---|---|
Comparison between actual and maximum cephalad angle | |
 actual angle ≤ maximum angle | 35 (87.5%) |
 actual angle > maximum angle | 5 (12.5%) |
Cephalad angle discrepancy | |
 accurate 0° ≤ Δa ≤ 5° n (%) | 28 (70%) |
 acceptable 5° < Δ ≤ 10° n (%) | 7 (17.5%) |
 inaccurate Δ > 10° n (%) | 5 (12.5%) |
Medial angle discrepancy | |
 accurate 0° ≤ Δ ≤ 5° n (%) | 32 (80%) |
 acceptable 5° < Δ ≤ 10° n (%) | 6 (15%) |
 inaccurate Δ > 10° n (%) | 2 (25%) |