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Table 1 Material parameters and element types of the model

From: Biomechanical study of transsacral-transiliac screw fixation versus lumbopelvic fixation and bilateral triangular fixation for “H”- and “U”-type sacrum fractures with traumatic spondylopelvic dissociation: a finite element analysis study

  Unit type Elastic modulus Poisson’s ratio Thickness/mm
Cortical bone S4R 12 000 0.3 0.5
Cancellous bone C3D8R、C3D4 100 0.2
Rear structure C3D8R、C3D4 3 500 0.25
Endplate S4R 2500 0.25 0.5
Articular cartilage C3D8R 25 0.4
Nucleus pulposus C3D8R 1.0 0.499 9
Annulus C3D8R 4.2 0.45
Anterior longitudinal ligament T3D2 7.8 0.3
Posterior longitudinal ligament T3D2 10 0.3
Ligamentum flavum T3D2 15 0.3
Interspinous ligament T3D2 10 0.3
Supraspinous ligament T3D2 8 0.3
Intertransverse ligament T3D2 10 0.3
Joint capsule ligament T3D2 7.5 0.3