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

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

  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