Application of a new calibration method for a three-dimensional finite element model of a human lumbar annulus fibrosus
| Autor: | Hendrik Schmidt, Antonius Rohlmann, Ulrich Simon, Lutz Claes, Frank Heuer, Annette Kettler, Hans-Joachim Wilke |
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| Rok vydání: | 2006 |
| Předmět: |
Materials science
Compressive Strength Finite Element Analysis Biophysics Modulus Models Biological Sensitivity and Specificity Stress (mechanics) Imaging Three-Dimensional Reference Values medicine Annulus (firestop) Humans Computer Simulation Orthopedics and Sports Medicine Calibration Finite element analysis Intervertebral disc Validation Optimization procedure Intervertebral Disc Lumbar Vertebrae business.industry Reproducibility of Results Stiffness Mechanics Structural engineering Elasticity (physics) 090300 BIOMEDICAL ENGINEERING Elasticity Finite element method 110600 HUMAN MOVEMENT AND SPORTS SCIENCE Calibration Bending moment Collagen Stress Mechanical medicine.symptom Material properties business Intervertebral Disc Displacement |
| Zdroj: | Clinical Biomechanics |
| ISSN: | 0268-0033 |
| DOI: | 10.1016/j.clinbiomech.2005.12.001 |
| Popis: | Background Major deficits of many finite element models of the lumbar spine are the oversimplification, assumed constellation of the material properties or the insufficiently performed calibration using experimental in vitro data. The aim of this study was, to develop a method for calibrating the two-composite structure of the annulus fibrosus, the ground substance and collagen fibers. Methods For that purpose, a three-dimensional, non-linear finite element model of a denucleated intervertebral disc with the adjacent vertebral bodies (L4–L5) was created. Previously performed in vitro experiments provided experimental data for the range of motion in each load direction, needed for calibration. A method was developed to determine the individual contribution of the fibers and the ground substance for bending moments with four different magnitudes (2.5, 5.0, 7.5 and 10 N m). For each bending moment, the stiffness of fibers was varied to approximate the Young’s modulus of the ground substance in order to fulfil the required range of motion obtained from in vitro results within an accuracy of 99%. Results Infinite material parameter combinations of collagen fibers and ground substance led to the same range of motion, which were different for each bending moment. However, there was only one combination, which was valid for all applied bending moments; and in all load direction. Interpretation This calibration method was performed on range of motion data; however, the procedure could also be applied to other loading scenarios and measurement parameters like disc bulge, translation and intradiscal pressure. |
| Databáze: | OpenAIRE |
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