Interlamellar matrix governs human annulus fibrosus multiaxial behavior

Sci Rep. 2020 Nov 9;10(1):19292. doi: 10.1038/s41598-020-74107-8.


Establishing accurate structure-property relationships for intervertebral disc annulus fibrosus tissue is a fundamental task for a reliable computer simulation of the human spine but needs excessive theoretical-numerical-experimental works. The difficulty emanates from multiaxiality and anisotropy of the tissue response along with regional dependency of a complex hierarchic structure interacting with the surrounding environment. We present a new and simple hybrid microstructure-based experimental/modeling strategy allowing adaptation of animal disc model to human one. The trans-species strategy requires solely the basic knowledge of the uniaxial circumferential response of two different animal disc regions to predict the multiaxial response of any human disc region. This work demonstrates for the first time the determining role of the interlamellar matrix connecting the fibers-reinforced lamellae in the disc multiaxial response. Our approach shows encouraging multiaxial predictive capabilities making it a promising tool for human spine long-term prediction.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Anisotropy
  • Annulus Fibrosus / anatomy & histology*
  • Annulus Fibrosus / physiology*
  • Cattle
  • Computer Simulation
  • Extracellular Matrix / metabolism
  • Humans
  • Intervertebral Disc / physiology*
  • Kinetics
  • Materials Testing
  • Models, Biological
  • Shear Strength
  • Stress, Mechanical
  • Tensile Strength
  • Tissue Engineering / methods