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Table 3 Univariate analysis of radiological factors

From: Risk factors for cut-outs in geriatric intertrochanteric fractures with cephalomedullary nailing after obtaining acceptable reduction: a case–control study

Factor

Overall

(n = 121)

Without cut-outs (n = 112)

Cut-outs

(n = 9)

p-value

OR (95% CI)

AO/OTA (%)

   

0.305b

N/A

31A1

64 (52.9)

61 (54.5)

3 (33.3)

  

31A2

52 (43.0)

46 (41.1)

6 (66.7)

  

31A3

5 (4.1)

5 (4.5)

0 (0)

  

Singh index (%)

   

0.544b

1.56 (0.37 to 6.54)

 ≤ 3

69 (57.0)

63 (56.3)

6 (66.7)

  

 > 3

52 (43.0)

49 (43.7)

3 (33.3)

  

Fixation type (%)

   

0.941b

0.95 (0.22 to 4.01)

Helical blade

39 (32.2)

36 (32.1)

3 (33.3)

  

Lag screw

82 (67.8)

76 (67.9)

6 (66.7)

  

Lateral wall fracture (%)

   

0.001b

8.16 (1.88 to 35.36)

No

107 (88.4)

102 (91.1)

5 (55.6)

  

Yes

14 (11.6)

10 (8.9)

4 (44.4)

  

Nail position quality (%)

   

0.072b

4.14 (0.84 to 20.36)

Poor

2 (1.7)

2 (1.8)

0

  

Questionable

13 (10.7)

10 (8.9)

3 (33.3)

  

Acceptable

106 (87.6)

100 (89.3)

6 (66.7)

  

Parker’s ratio (AP)

49.04 ± 8.44

48.49 ± 7.95

54.54 ± 12.44

0.193

1.09 (0.89 to 1.18)

Parker’s ratio (Lat.)

49.32 ± 9.23

49.17 ± 8.52

51.16 ± 16.38

0.538

1.02 (0.95 to 1.11)

TAD, mm

18.93 ± 4.90

18.65 ± 4.74

22.44 ± 5.76

0.025

1.16 (1.01 to 1.33)

CalTAD, mm

22.51 ± 5.88

22.07 ± 5.68

27.99 ± 5.89

0.003a

1.19 (1.05 to 1.35)

  1. a Student’s t-test, the results are shown as mean ± standard deviation
  2. b Chi-square test, the results are shown as number (percentage)
  3. OR odds ratio, CI confidence interval, AO/OTA AO Foundation and Orthopaedic Trauma Association, AP anteroposterior view, Lat. lateral view, TAD tip-apex-distance, CalTAD calcar referenced tip-apex-distance