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Table 4 The hazard ratios for risk factors of conversion to THA for patients undergoing autologous or allogeneic fibular grafts

From: Long-term survival and clinical outcomes of non-vascularized autologous and allogeneic fibular grafts are comparable for treating osteonecrosis of the femoral head

Variables Model 1 Model 2 Model 3 Model 4
HR (95% CI) HR (95% CI) HR (95% CI) HR (95% CI)
Surgical methods  
Autologous fibular grafts 1.00 (reference) 1.00 (reference) 1.00 (reference) 1.00 (reference)
Allogeneic fibular grafts 1.624 (0.583–4.526) 1.77 (0.634–4.936) 1.897 (0.69–5.218) 1.716 (0.615–4.786)
Age  
 ≤ 37 years   1.00 (reference)   
 > 37 years   6.931 (1.996–24.074)*   
BMI  
 ≤ 24   1.00 (reference)   
 > 24   2.249 (0.841–6.015)   
ARCR stage  
 Stage II   1.00 (reference)   
 Stage III   0.823 (0.312–2.173)   
Etiologies  
 Glucocorticoid   0.881 (0.16–4.844)  
 Alcoholic   2.817 (0.623–12.739)  
 Traumatic    0.395 (0.052–3.003)
 Idiopathic    0.905 (0.119–6.891)
  1. Note:
  2. Model 1: Cox hazard proportional analysis without adjustment
  3. Model 2: Multivariate Cox hazard proportional analysis including age, BMI, and ARCR stage
  4. Model 3: Multivariate Cox hazard proportional analysis including glucocorticoid and alcoholic
  5. Model 4: Multivariate Cox hazard proportional analysis including traumatic and idiopathic
  6. *p < 0.05, > 0.05