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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°.