Table 3.

Angulation information obtained by ultrasonography

	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%)

^aΔ indicates the discrepancy between the suggested and actual angles