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Table 1 The material properties of a series of FE models of intact and fixed pelvises[1421]

From: Parallel analysis of finite element model controlled trial and retrospective case control study on percutaneous internal fixation for vertical sacral fractures

Item

Elastic modulus

Poisson ratio

Frictional coefficient

Cross section area

E(MPa)

μ

f

A(mm2)

Titanium plate

110000

0.30

0.45

Titanium screw

110000

0.30

Cortical bone

17000

0.3

0.4

Cancellous bone

129

0.2

0.4

Articular cartilage

11.9.40-0.48

  

Interpubic disc

5

0.45

SIJCL matrix

2.146-4.291

0.49

SIJCL fibers

105

0.3

392.00

Pelvic ligaments

    

ASIL

251.3

0.3

19.38

PSIL

251.3

0.3

79.40

ISIL

251.3

0.3

66.24

SSL

251.3

0.3

32.22

STL

251.3

0.3

79.74

SPL

251.3

0.3

12.82

APL

251.3

0.3

7.43

PL

251.3

0.3

6.76

IL

251.3

0.3

20.26

  1. Note: SIJCL matrix (Mooney-Rivlinhyperelasticity): W = C10(I1-3) + C01(I2-3), (C10 + C01) = E/4(1 + μ), E = 2.146–4.291 MPa, μ = 0.49; I1 and I2 are the first and second invariants of the Cauchy-Green tensor. The first type of SI joint (SI1) simulates to approach normal state (E 1 = 4.291 MPa; μ 1 = 0.49; f 1 = 0); the second type of SI joint (SI2) simulates slight weaken state (E 2 = 3.128 MPa; μ 2 = 0.49; f 2 = 0.24); the third type of SI joint (SI3) simulates moderate weaken state (E 2 = 2.146 MPa; μ 2 = 0.49; f 2 = 0.48) [14, 21].