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Table 1 Material properties assigned to the FE model

From: Interlaminar stabilization offers greater biomechanical advantage compared to interspinous stabilization after lumbar decompression: a finite element analysis

Component Element type Young modulus (MPa) Poisson ratio Cross-sectional area (mm2)
Bone     
 Cortical bone C3D4 12,000 0.3  
 Cancellous bone C3D4 100 0.2  
 Cartilage endplate C3D8 24 0.4  
 Intervertebral disc     
 Nucleus pulpous C3D8 1 0.49  
 Annulus ground substance C3D8H Hyperelastic (C10 = 0.18, C01 = 0.045)   
 Annulus fibers T3D2 Hypoelastic (360–550 MPa)   
Ligaments     
 Anterior longitudinal T3D2 15.6 (< 12%), 20 (> 12%)   63.7
 Posterior longitudinal T3D2 10 (< 11%), 20 (> 11%)   20
 Ligamentum flavum T3D2 15 (< 6.2%), 19.5 (> 6.2%)   40
 Capsular T3D2 7.5 (< 25%), 32.9 (> 25%)   30
 Interspinous T3D2 10 (< 20%), 11.6 (> 20%)   40
 Supraspinous T3D2 8.0 (< 20%), 15 (> 20%)   30
 Intertransverse T3D2 10 (< 18%), 58.7 (> 18%)   2
Implants     
 Coflex device, screws, and rods (titanium) C3D4 110,000 0.3