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Table 2 Univariate analysis of factors associated with implant failure (n = 45)

From: Risk factors for implant failure in reverse oblique and transverse intertrochanteric fractures treated with proximal femoral nail antirotation (PFNA)

ParameterImplant failureOR (CI)p value
No, number (%)Yes, number (%)
Sex  0.63 (0.11–3.51)0.593
 Male15 (38)3 (50)  
 Female24 (62)3 (50)  
Age  1.50 (0.16–14.56)0.727
 < 65 years9 (23)1 (17)  
 ≥ 65 years30 (77)5 (83)  
BMI
 < 18.5*3 (8)0 (0)Undefined 
 18.5–23.920 (51)2 (33)  
 ≥ 24.0*16 (41)4 (67)2.50 (0.41–15.43)0.324
Mechanism of injury  0.58 (0.06–5.58)0.637
 Low energy29 (74)5 (83)  
 High energy10 (26)1 (17)  
ASA score
 13 (8)0 (0)Undefined 
 222 (56)5 (83)3.18 (0.34–30.16)0.313
 314 (36)1 (17)  
AO/OTA classification
 31A-3.17 (18)1 (17)  
 31A-3.27 (18)0 (0)Undefined 
 31A-3.325 (64)5 (83)1.40 (0.14–14.03)0.775
Reduction method  2.11 (0.35–12.86)0.420
 Closed20 (51)2 (33)  
 Open19 (49)4 (67)  
Lateral femoral wall  2.90 (0.50–16.76)0.234
 Reduced29 (74)3 (50)  
 Displaced10 (26)3 (50)  
Reduction quality
 Poor2 (5)3 (50)14.50 (1.69–124.24)0.015
 Acceptable8 (21)0 (0)Undefined 
 Good29 (74)3 (50)  
Posteromedial support  12.00 (1.65–87.52)0.014
 Existence36 (92)3 (50)  
 Loss3 (8)3 (50)  
  1. *BMI (body mass index); 18.5–23.9 as the reference value