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Table 2 The comparison between the figure-of-eight and figure-of-zero wirings

From: Where should Kirschner wires be placed when fixing patella fracture with modified tension-band wiring? A finite element analysis

 

SP 1

SP 2

SP 3

SP 4

SP 5

Mean

Fashions comparison

Total separation (mm)

      

P = 0.008

 Figure-of-eight

0.41

0.31

0.29

0.30

0.29

0.32

 Figure-of-zero

0.28

0.20

0.17

0.17

0.15

0.19

Pressure (MPa)

      

P = 0.666

 Figure-of-eight

− 0.10

+ 0.06

+ 0.23

+ 0.28

+ 0.40

+ 0.17

 Figure-of-zero

− 0.05

+ 0.12

+ 0.26

+ 0.36

+ 0.48

+ 0.23

IPSA%

      

P = 0.617

 Figure-of-eight

40.00

42.87

30.27

20.43

13.98

29.51

 Figure-of-zero

36.82

37.43

27.62

14.86

10.46

25.44

Stress of K-wires (MPa)*

      

P = 0.625

 Figure-of-eight

142.51

110.88

96.64

92.73

85.13

105.58

 Figure-of-zero

141.49

104.56

86.46

82.68

72.54

97.55

Stress of SS-wires (MPa)*

      

P = 0.096

 Figure-of-eight

95.01

76.62

84.58

89.46

92.40

87.61

 Figure-of-zero

85.80

74.33

80.58

79.08

82.78

80.51

  1. SP sagittal position, IPSA improper stress area
  2. *The average von Mises stress of K-wires was significantly higher than that of SS-wires (P = 0.049)