Efficacy of closed reduction for developmental dysplasia of the hip: midterm outcomes and risk factors associated with treatment failure and avascular necrosis

Table 2 The univariate analysis of the risk factors related to the CR in the treatment of DDH

	Satisfactory group	Unsatisfactory group	P
Number of patients (n)	72	38
Age at initial CR (Mo)	15.72 ± 4.74	18.17 ± 5.04	0.013
MI after CR	31.38 ± 4.75	34.69 ± 3.81	< 0.001
Age grading at initial CR (n)			0.007
≤ 18.35 months	48	16
> 18.35 months	24	22
Sex (n)			0.532
Male	10	7
Female	62	31
Laterality (n)			0.757
Unilateral DDH	53	29
Bilateral DDH	19	9
MI after CR			< 0.001
< 35.35 mm	57	16
> 35.35 mm	15	22
Seniority of orthopedists (n)			0.137
≤ 15 years	25	8
> 15 years	47	30
Presence of femoral ossific nucleus (n)			0.49
Yes	61	34
No	11	4
IHDI grade (n)			0.010
II	25	4
III	26	14
IV	21	20
AI at the initial CR (°)	35.92 ± 6.49	37.53 ± 5.45	0.196

ISSN: 1749-799X