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Structural behavior of human lumbar intervertebral disc under direct shear
Hendrik Schmidt1, Kim Häussler, Hans-Joachim Wilke
12 Julius Wolff Institut, Charité - Universitätsmedizin Berlin, Berlin - Germany.
Journal of Applied Biomaterials & Functional Materials
|April 19, 2014
Summary
This study measured the shear properties of human lumbar intervertebral discs (IVDs) under different loading directions. Results provide crucial data for validating biomechanical models of spinal stability.
Area of Science:
- Biomechanics
- Spinal Anatomy
- Materials Science
Background:
- Intervertebral discs (IVDs) are crucial for spinal flexibility and load transmission.
- Finite element models (FEM) require experimental validation for accurate degeneration prediction.
- Existing FEM lack shear property data, limiting model validation.
Purpose of the Study:
- Investigate the structural shear properties of human lumbar IVDs.
- Determine shear behavior in posteroanterior (PA) and laterolateral (LL) loading directions.
- Provide experimental data for validating IVD FEM.
Main Methods:
- Fourteen human lumbar IVDs were subjected to direct shear testing.
- A custom shear device and materials testing machine were utilized.
- Shear stiffness, ultimate force, displacement, and work to failure were quantified.
Main Results:
- Median shear stiffness was 490 N/mm (PA) and 568 N/mm (LL).
- Median ultimate shear forces were 2,877 N (PA) and 3,199 N (LL).
- Work to failure averaged 12 Nm (PA) and 9 Nm (LL).
Conclusions:
- Direct shear properties of human lumbar IVDs were experimentally determined.
- Findings enhance understanding of IVD structure-function relationships.
- Data is essential for validating and improving FEM of the IVD.
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