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Table 4 The univariate analysis of the risk factors related to the incidence of AVN of the femoral head after CR

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

  non-AVN AVN P
Number of patients (n) 66 6  
Age at initial CR (Mo) 15.97 ± 4.67 12.98 ± 45.04 0.141
Sex (n)    1
 Male 9 1  
 Female 57 5  
Laterality (n)    0.936
 Unilateral DDH 48 5  
 Bilateral DDH 18 1  
Percutaneous adductor tenotomy (n)    0.308
 Yes 24 4  
 No 42 2  
Seniority of orthopedists (n)    0.086
 ≤ 15 years 25 0  
 > 15 years 41 6  
Presence of femoral ossific nucleus (n)    1
 Yes 10 1  
 No 56 5  
IHDI grade (n)    0.703
 II 23 2  
 III 23 3  
 IV 20 1  
MI after CR 31.83 ± 3.40 26.55 ± 4.64 0.008
AI at the initial CR (°) 35.80 ± 6.60 37.33 ± 5.48 0.582