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Table 4 Percent reduction of the pullout and rotational strengths of the following screws relevant to those of the original screws of the C- and H-type screws

From: Conventional versus helical blade screw insertion following the removal of the femoral head screw: a biomechanical evaluation using trochanteric gamma 3 locking nail versus PFN antirotation

 

C2

 

H2

 

C1-C2

H1-ROC2

H1-RXC2

 

H1-H2

C1-ROH2

C1-RXH2

 

RD (%)

p value

RD (%)

p value

RD (%)

p value

 

RD (%)

p value

RD (%)

p value

RD (%)

p value

 

Pullout

 

Pullout

PCF 5

31.11

< 0.001

37.26

< 0.001

36.71

< 0.001

PCF 5

11.84

< 0.001

26.77

< 0.001

23.67

< 0.001

PCF 10

22.6

< 0.001

41.15

< 0.001

39

< 0.001

PCF 10

1.44

0.358

11.66

< 0.001

15.54

< 0.001

PCF 15

27.5

< 0.001

31.14

< 0.001

30.25

< 0.001

PCF 15

4.32

0.001

26.93

< 0.001

28.11

< 0.001

 

Clockwise rotation

 

Clockwise rotation

PCF 5

51.13*

< 0.001

62.10*

< 0.001

54.83*

< 0.001

PCF 5

5.93

 

12.52

< 0.001

9.68

< 0.001

PCF 10

53.20*

< 0.001

72.55*

< 0.001

67.90*

< 0.001

PCF 10

21.54

 

23.69

< 0.001

4.62

0.102

PCF 15

46.69

< 0.001

60.00*

< 0.001

57.43*

< 0.001

PCF 15

12.31

 

28.78

< 0.001

24.89

< 0.001

 

Counterclockwise rotation

 

Counterclockwise rotation

PCF 5

47.13

< 0.001

64.52*

< 0.001

65.69*

< 0.001

PCF 5

1.21

0.564

10.81

< 0.001

11.43

< 0.001

PCF 10

50.19*

< 0.001

60.48*

< 0.001

54.33*

< 0.001

PCF 10

18.67

< 0.001

18.13

< 0.001

1.74

0.441

PCF 15

40.84

< 0.001

47.76

< 0.001

43.41

< 0.001

PCF 15

7.04

0.015

7.48

0.015

3.48

0.218

  1. C conventional-type screw; H helical blade-type screw; RO, following screw insertion after reaming; RX, following screw insertion without reaming; RD, strength reduction rate (%) compared with original screw; PCF pounds per cubic feet
  2. *50% above strength reduction compared with original screw
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BMC Musculoskeletal Disorders

ISSN: 1471-2474

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