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Transversely isotropic material characterization of the human anterior longitudinal ligament
Mitchell Hortin1, Sarah Graham1, Kara Boatwright1
1Brigham Young University, Department of Mechanical Engineering, Provo, UT 84602, USA.
Abstract:
The present work represents the first study to report transversely isotropic material parameters for the human anterior longitudinal ligament (ALL) in the thoraco-lumbar spine. Force-deformation data from multi-axial testing was collected from 30 cadaveric spine test specimens using an anisotropic quarter punch test technique. The experimental data was fit to a commonly used anisotropic soft tissue material model using an FEA system identification technique. The material model correlated well with the experimental response (R(2)≥0.98). The constitutive parameter values, as well as the nonlinear anisotropic stress-strain response of the ALL specimens are reported to facilitate application to biomechanical models (including finite element models) of the spine.
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