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Table 2 Risk factors for THA requirement after RAO assessed by univariate and multivariate regression analyses

From: Ten-year survival rate after rotational acetabular osteotomy in adulthood hip dysplasia

Variables Hazard ratio 95% Confidence Interval p value
Univariate regression
 Preoperative
  Age at the time of surgery 1.248 1.059–1.471 0.008
  Body mass index 0.986 0.711–1.369 0.934
  Smoking history 0.036 0.000–67.106 0.386
  Presence of cysts 7.329 0.900–59.685 0.063
  Deformity of the femoral head 0.515 0.063–4.208 0.536
  Center edge angle (°) 0.958 0.909–1.011 0.119
  Sharp angle (°) 1.056 0.892–1.250 0.527
  Acetabular head index (%) 0.964 0.909–1.022 0.220
  Acetabular roof obliquity (°) 1.023 0.923–1.134 0.662
  Obturator foramen-head distance (mm) 1.200 0.972–1.481 0.091
  Joint space width (mm) 0.655 0.449–0.957 0.029
  Radiographic stage 2.691 1.205–6.013 0.016
 Immediately after the surgery
  Center edge angle (°) 0.996 0.944–1.052 0.896
  Sharp angle (°) 1.058 0.969–1.154 0.206
  Acetabular head index (%) 0.992 0.931–1.057 0.803
  Acetabular roof obliquity (°) 1.023 0.966–1.083 0.435
  Obturator foramen-head distance (mm) 0.982 0.838–1.152 0.828
  Joint space width (mm) 0.674 0.428–1.060 0.088
  Radiographic stage 1.693 0.664–4.317 0.271
  Joint congruity 1.981 0.898–4.372 0.091
  Thickness of the transferred acetabulum 0.991 0.848–1.159 0.911
Multivariate regression
 Age at the time of surgery 1.293 1.041–1.606 0.020
 Preoperative Joint space width 1.327 0.533–3.301 0.543
 Radiographic stage 4.155 0.413–41.812 0.227
  1. N = 65 hips
  2. THA total hip arthroplasty, RAO rotational acetabular osteotomy