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Strain uncertainties from two digital volume correlation approaches in prophylactically augmented vertebrae: Local
Gianluca Tozzi1, Enrico Dall'Ara2, Marco Palanca3
1School of Engineering, University of Portsmouth, UK.
Journal of the Mechanical Behavior of Biomedical Materials
|December 20, 2016
Summary
Digital volume correlation (DVC) reliably measures bone and biomaterial deformation in augmented vertebrae. Larger sub-volumes minimize random errors, crucial for clinical applications like vertebroplasty.
Area of Science:
- Biomechanics
- Biomaterials Science
- Medical Imaging
Background:
- Digital volume correlation (DVC) quantifies deformation in biological tissues and bone-biomaterial systems.
- Reliability of DVC in orthopaedic applications, particularly vertebroplasty, requires further investigation.
Purpose of the Study:
- Evaluate systematic and random errors in two DVC approaches (ShIRT-FE and DaVis-DC).
- Assess DVC accuracy across different microstructures: trabecular bone, cortical bone, and cement-bone interfaces.
Main Methods:
- Micro-focus computed tomography (micro-CT) combined with in situ mechanical testing.
- Application of global (ShIRT-FE) and local (DaVis-DC) DVC methods.
- Analysis of error metrics (systematic, random, MAER, SDER) using varying sub-volume sizes (16-voxel and 48-voxel).
Main Results:
- Systematic error was independent of sub-volume size.
- Random error decreased significantly with larger sub-volumes (48-voxel) across trabecular and cement regions.
- The global ShIRT-FE approach showed lower error at the cortical surface compared to the local DaVis-DC approach.
Conclusions:
- This study provides initial insights into the reliability and limitations of DVC for micromechanics analysis in augmented vertebrae.
- Larger sub-volume sizes are recommended to minimize random errors in DVC analysis.
- DVC shows promise for evaluating bone-biomaterial interfaces in orthopaedic contexts.
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