...Jill M. Middendorf; Victor H. Barocas Tears in the annulus fibrosus (AF) of the intervertebral disk (IVD) occur due to multiaxial loading on the spine. However, most existing AF failure studies measure uniaxial stress, not the multiaxial stress at failure. Delamination theory, which requires...

...Sabrina I. Sinopoli; Diane E. Gregory The annulus fibrosus is the ring-like exterior of the intervertebral disc, which is composed of concentrically organized layers of collagen fiber bundles. The mechanical properties of the annulus have been studied extensively; however, tests are typically...

...Shambo Bhattacharya; Devendra K. Dubey Radial variation in water concentration from outer to inner lamellae is one of the characteristic features of annulus fibrosus (AF). In addition, water concentration changes are also associated with intervertebral disc (IVD) degeneration. Such changes alter...

...Ruspi Maria Luisa; Cristofolini Luca Contrasting results are reported when the spine is tested at different strain rates. Tissue specimens from the ligaments or the intervertebral discs (IVD, including annulus fibrosus and nucleus pulposus) exhibit higher stiffness and lower dissipation at high...

...Mirit Sharabi; Aviad Levi-Sasson; Roza Wolfson; Kelly R. Wade; Fabio Galbusera; Dafna Benayahu; Hans-Joachim Wilke; Rami Haj-Ali The annulus fibrosus (AF) of the intervertebral disc (IVD) consists of a set of concentric layers composed of a primary circumferential collagen fibers arranged...

... Annulus Fibrosus to Compression ,” Clin. Biomech. (Bristol, Avon) , 16 ( 2 ), pp. 121 – 128 . 10.1016/S0268-0033(00)00075-9 [13] Seroussi , R. E. , Krag , M. H. , Muller , D. L. , and Pope , M. H. , 1989 , “ Internal Deformations of Intact and Denucleated Human Lumbar Discs...

... the shear behavior of the interlamellar compartment would enhance the study of its mechanobiology. In this study, physical experiments were utilized to describe interlamellar shear and define a constitutive model, which was implemented into a finite element analysis. Ovine annulus fibrosus (AF) specimens...

...Ugur M. Ayturk; Benjamin Gadomski; Dieter Schuldt; Vikas Patel; Christian M. Puttlitz Using a continuum approach for modeling the constitutive mechanical behavior of the intervertebral disk’s annulus fibrosus holds the potential for facilitating the correlation of morphology and biomechanics...

...-electrochemical properties nondestructively. Bovine knee articular cartilage and lumbar annulus fibrosus were used in this study to demonstrate that this technique could be used on different types of tissue. The results show that our newly developed method is capable of precisely predicting the water volume...

... biochemistry biomechanics bone cellular biophysics deformation finite element analysis patient treatment glucose annulus fibrosus nucleus pulposus mechanical loading cell density Each year, millions of Americans experience symptoms of low back pain, resulting in annual expenditures...

... components, in particular the annulus fibrosus, with respect to global motion is not well understood in spite of the relatively large literature base with respect to the local ex vivo mechanical properties of the tissue. The primary objective of this study was to implement the nonlinear and orthotropic...

... hypothesized that electrical conductivity in human IVD is strain-dependent, due to change in tissue composition caused by compression, and inhomogeneous, due to tissue structure and composition. We also hypothesized that conductivity in human annulus fibrosus (AF) is anisotropic, due to the layered structure...