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Table 2 Univariate analysis of variables associated with screw cut-out in PFN group

From: Cut-out risk factor analysis after intramedullary nailing for the treatment of extracapsular fractures of the proximal femur: a retrospective study

 

All patients (n = 83)

No Cut-out (n = 77)

Cut-out (n = 6)

p-value

Odds ratio

95% Cl

Age at surgery

78.3

77.4

83.7

0.316

1.06

0.95–1.19

Sex

   

0.330

  

Female

62 (74.7%)

56

6

   

Male

21 (25.3%)

21 (100%)

0

   

BMI (kg/m 2 )

21.1

20.8

25.1

0.019

1.30

1.04–1.62

Days to Surgery

3.2

3.1

3.6

0.554

1.05

0.89–1.24

Fracture classification

   

0.519

  

AO/OTA A1

64 (77.1%)

60 (93.75%)

4 (6.25%)

   

AO/OTA A2

14 (16.8%)

12 (85.7%)

2 (14.3%)

   

AO/OTA A3

5 (6.1%)

5 (100%)

0

   

Basicervical fracture extension

   

0.007

13.40

2.17–82.93

No

69 (83.1%)

67 (97.1%)

2 (2.9%)

   

Yes

14 (16.9%)

10 (71.4%)

4 (28.6%)

   

Singh index

   

0.658

  

<=3

54 (66.3%)

49 (94.4%)

5 (5.6%)

   

>3

29 (33.7%)

28 (96.6%)

1 (3.4%)

   

Cleveland index

   

0.549

  

Ideal (zone 5, 8)

49 (59.0%)

44 (89.7%)

5 (10.3%)

   

Non-ideal (zone 4, 6, 7, 9)

34 (41.0%)

33 (97.1%)

1 (2.9%)

   

Tip-Apex distance (mm)

14.5

14.5

13.6

0.645

0.94

0.74–1.21

Neck-shaft angle

   

0.300

  

Good (<5 degrees)

39 (47.0%)

38 (97.4%)

1 (2.6%)

   

Acceptable (5–10 degrees)

25 (30.1%)

22 (88.0%)

3 (12.0%)

   

Poor (>10 degrees)

19 (22.9%)

17 (89.5%)

2 (10.5%)

   

Neck-screw axis

   

0.248

  

Good (<5 degrees)

60 (72.3%)

57 (95.0%)

3 (5.0%)

   

Acceptable (5–10 degrees)

17 (20.5%)

15 (88.2%)

2 (11.8%)

   

Poor (>10 degrees)

6 (7.2%)

5 (83.3%)

1 (16.7%)

   

Reduction quality (AP view)

   

0.032

  

Extramedullary

34 (41.0%)

33 (94.3%)

1 (5.7%)

   

Anatomical

48 (57.8%)

44 (91.7%)

4 (8.3%)

   

Intramedullary

1 (1.2%)

0

1 (100%)

   

Reduction quality (axial view)

   

0.043

  

Extramedullary

18 (21.7%)

18 (100%)

0

   

Anatomical

46 (55.4%)

44 (95.6%)

2 (4.4%)

   

Intramedullary

19 (22.9%)

15 (78.9%)

4 (21.1%)

   

Anti-rotation screw pull-out

8 (9.6%)

6 (75.0%)

2 (25.0%)

0.041

5.92

0.89–39.20

  1. BMI body mass index, CI confidence interval, PFN proximal femur nail