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Table 1 General information of DDH children between 3DP group and CS group

From: Performance of Tönnis triple osteotomy in older children with developmental dysplasia of the hip (DDH) assisted by a 3D printing navigation template

Parameter

3DP group (n = 20)

CS group (n = 18)

P value

Age, y

11.7 ± 2.5

11.5 ± 2.0

0.628

Gender

 Male

4

3

0.396

 Female

16

15

Side

 Left

9

9

0.819

 Right

11

9

Follow-up time, M

30.3 ± 3.4

31.5 ± 2.5

0.726

sharp angle(°)

52.7 ± 4.8

48.2 ± 2.6

0.689

center-edge angle(°)

16.5 ± 2.8

14.7 ± 6.8

0.897

acetabular roof angle(°)

36.8 ± 2.6

37.4 ± 3.1

0.916

acetabular head index(°)

56.8 ± 2.1

49.8 ± 3.2

0.732

crossover sign

 positive

3

2

0.723

 negative

17

16

ischial spine sign

 positive

4

6

0.351

 negative

16

12