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Table 1 Material properties of lumbar spine

From: Application of an interspinous process device after minimally invasive lumbar decompression could lead to stress redistribution at the pars interarticularis: a finite element analysis

Material Element Type Young’s Modulus (MPa) Poisson’s Ratio Area (mm2)
Bone
 Cortical 8-node SOLID185 Ex = 11,300 ν xy = 0.484
Ey = 11,300 ν xz = 0.203
Ez = 22,000 ν yz = 0.203  
Gx = 3800   
Gy = 5400   
Gz = 5400   
 Cancellous 8-node SOLID185 Ex = 140 ν xy = 0.45
Ey = 140 ν xz = 0.315  
Ez = 200 ν yz = 0.315  
Gx = 48.3   
Gy = 48.3   
Gz = 48.3   
 Posterior element 8-nodeSOLID185 3500 0.25
Disc
 Nucleus pulposus 8-node SOLID185 1.66 0.499
 Ground Substance 8-node SOLID185 5.36 0.45
   C10 = 0.42 C01 = 0.105  
Annulus Fibers 2-node LINK10    
 Outermost 550 0.76
 Second 495 0.5928
 Third 412.5 0.4712
 Innermost 357.5 0.3572
Endplate 8-node SOLID185 24 0.4
Ligament 2-node LINK10    
 ALL 7.8 24
 PLL 10 14.4
 TL 10 3.6
 LF 15 40
 ISL 10 26
 SSL 8 23
 CL 7.5 30
  1. C10, C01 indicated two parameters of Mooney-Rivlin hyperelastic formation; d, material incompressibility parameter; ALL anterior longitudinal ligament, CL capsular ligament, ISL interspinous ligament, LF ligamentum flavum, PLL posterior longitudinal ligament, SSL supraspinous ligament, TL transverse ligament