Table 1.

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

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