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Table 1 Univariate analysis of factors affecting femoral head necrosis

From: Osteonecrosis of femoral head in young patients with femoral neck fracture: a retrospective study of 250 patients followed for average of 7.5 years

Index n ONFH group
(n = 40)
No-ONFH group
(n = 210)
χ2 P
Age     0.940 0.625
 18~25 25 5 20   
 26~40 35 7 28   
 41~60 190 28 162   
Gender     0.001 0.978
 Male 113 18 95   
 Female 137 22 115   
Preoperative traction     2.268 0.132
 Yes 83 24 151   
 No 167 16 59   
Time from injury to operation (h)     0.021 0.884
 ≤ 24 85 14 71   
 ≥ 24 165 26 139   
Reduction method     0.005 0.941
 Closed reduction 80 13 67   
 Opened reduction 170 27 143   
Start time of postoperative weight-bearing (months)     0.733 0.693
 < 3 23 5 18   
 3~6 197 31 166   
 > 6 30 4 26   
Type of fracture     8.316 0.004
  No-displacement fracture 108 9 99   
 Displacement fracture 142 31 111   
Quality of reduction     14.345 < 0.001
 Satisfied 165 16 149   
 Dissatisfied 85 24 61   
Removal of internal fixation     7.459 0.006
 Yes 171 20 151   
 No 79 20 59   
BMI (kg/m2)     17.769 < 0.001
 ≥ 25 79 24 55   
 < 25 171 16 155   
Fracture season     0.082 0.994
 Spring 53 8 45   
 Summer 41 7 34   
 Autumn 36 6 30   
 Winter 120 19 101   
ASA classification     13.462 < 0.001
 I + II 135 11 124   
I II + IV 115 29 86   
Harris Hip score      
 > 90 20 0 20   
 81–90 126 7 119   
 71–80 80 15 65   
 < 70 24 18 6   
  1. Harris Hip score: > 90 very good, 81–90 good, 71–80 neutral, < 70 not good