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Table 1 Baseline characteristics of all recruited patients

From: Nomogram to predict collapse-free survival after core decompression of nontraumatic osteonecrosis of the femoral head

Variable Collapse group (n = 44) Survival group (n = 129) p value
Age (years) 43.3 ± 7.4 43.2 ± 8.7 0.965
Gender (male/female) 38/6 112/17 0.938
Body mass index (kg/m2) 24.5 ± 4.5 24 ± 3.7 0.512
Etiology    0.312
 Alcohol abuse 31 82  
 Corticosteroid use 8 19  
 Idiopathic 5 28  
Ficat classification    0.741
 Stage I 4 14  
 Stage IIA 40 115  
ARCO classification    < .001
 IA 2 6  
 IB 2 7  
 IC 0 1  
 IIA 4 63  
 IIB 10 41  
 IIC 26 11  
Symptom    < .001
 Acute onset of symptom 14 23  
 Asymptomatic 24 79  
 Delayed onset of symptom 6 27  
Necrotic location    < .001
 A 1 22  
 B 3 45  
 C1 15 51  
 C2 25 11  
Necrotic angle    < .001
 < 200° 5 74  
 200–249° 10 36  
 250–299° 18 12  
 > 299° 11 7  
BME before CD    < .001
 No 29 116  
 Yes 15 13  
Bone grafting (no. of hips)    0.542
 No 25 80  
 Yes 19 49  
Triglyceride 2.05 ± 1.16 1.95 ± 1.17 0.611
Total cholesterol 4.50 ± 0.80 4.66 ± 0.92 0.305
White blood cell 6.6 ± 2 6.7 ± 1.9 0.857
Hemoglobin 138.0 ± 12.1 140.0 ± 16.8 0.493
Platelet 188.8 ± 53.5 186.3 ± 49.9 0.787
Antithrombin III 93 ± 11.9 92.5 ± 10.7 0.789
  1. BME, bone marrow edema; CD, core decompression; ARCO, Association Research Circulation Osseous classification