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Table 2 Sonographic measurement differences between acetabular index normalization time groups

From: Natural history of hip instability in infants (without subluxation or dislocation): a three year follow-up

Sonographic measurement Group I Group II p value
  Normalized before 7 months of age, number of hips =17 Normalized after 7 months of age, number of hips =31  
  Number of hips measured on sonography Sonographic measurement Number of hips measured on sonography Sonographic measurement  
  n/17 Mean (mm) SD (mm) n/31 Mean (mm) SD (mm)  
LSCNmid 10 0.99 0.58 16 1.7 0.42 0.001
LSCFaddMAD 14 4.66 1.16 26 3.72 0.84 0.005
LSCFmad 14 3.94 1.04 26 3.39 0.55 0.035
LSCFaddBC 14 0.56 0.07 26 0.61 0.07 0.049
FSTFΔa/ΔD 17 3.25 9.29 28 -0.68 5.38 0.078
FSCFΔsce 16 1.43 7.78 25 -3.44 9.02 0.083
LSTFmad 14 3.81 0.95 26 3.30 0.90 0.099
  1. Variable key: Time of measurement description (FS = first sonogram, LS = last sonogram) and code for measurement (see Additional file 1). All infants’ hips exhibited hip instability with stress and seated at rest with or without acetabular dysplasia on sonography. Normalization is radiographic AI ≤25°.