Dynamic Tensile Behavior of Fiber Bundles Isolated from Spinal Neve Roots: Effects of Anatomical Site and Loading Rate on Mechanical Strength

[+] Author and Article Information
Atsutaka Tamura

Tottori University, 4-101 Koyama-minami, Tottori 680-8552, Japan

Mizuki Sakaya

Tottori University, 4-101 Koyama-minami, Tottori 680-8552, Japan

1Corresponding author.

ASME doi:10.1115/1.4039560 History: Received November 30, 2017; Revised February 28, 2018


We found a significant difference (P < 0.05) between the linear portion of the elastic modulus (~20 MPa) and tensile strength (~2 MPa) at the 0.2 mm/s (low: 0.01 s¬-1), 2 mm/s (medium: 0.11 s-1), and 20 mm/s (high: 1.11 s-1) loading rates by performing a series of uniaxial stretching tests. However, the mechanical properties of the neural fiber bundles were resultantly of the same magnitude, indicating that their mechanical responses were relatively insensitive to a given strain rate regardless of a 100-fold increase in the applied stretching velocities. We also confirmed that a "spinal level effect" exists in the nerve roots, i.e., a fiber bundle isolated from the lumbar spinal level is weaker in mechanical strength compared to that from the cervical and thoracic spinal levels (P < 0.05), suggesting that closer attention should be paid to an anatomical site from which test samples are excised.

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