Kourtis Lampros C, Carter Dennis R, Kesari Haneesh, Beaupre Gary S
Bone and Joint Center of Excellence, VA Palo Alto Health Care System, Palo Alto, CA 94304, USA.
Comput Methods Biomech Biomed Engin. 2008 Oct;11(5):463-76. doi: 10.1080/10255840801930728.
This study introduces, validates and demonstrates a new automated software tool (VA-BATTS) to calculate bone stresses within a bone cross section subjected to bending, axial, torsional and transverse shear far-field loading conditions, using quantitative computed tomography (QCT) data.
A QCT image is imported and processed to generate a 2D finite element (FE) mesh of the bone with inhomogeneous (CT-based) transversely isotropic material properties. Bending and axial stresses are determined using inhomogeneous beam theory; torsional and transverse shear stresses are calculated using a new 2D FE formulation.
Validation studies show excellent agreement between results obtained using VA-BATTS and results obtained using analytical 2D models and inhomogeneous 3D FE models.
Out-of-plane bone stresses can be accurately calculated using a 2D analysis. Material inhomogeneity can have a marked effect on predicted stresses. In three-point bending experiments, transverse shear may present important contributions to the failure potential. The software is available at https://simtk.org/home/va-batts.
本研究介绍、验证并展示了一种新的自动化软件工具（VA-BATTS），该工具利用定量计算机断层扫描（QCT）数据，计算在弯曲、轴向、扭转和横向剪切远场载荷条件下骨横截面内的骨应力。
导入并处理QCT图像，以生成具有非均匀（基于CT）横观各向同性材料特性的骨二维有限元（FE）网格。使用非均匀梁理论确定弯曲应力和轴向应力；使用新的二维有限元公式计算扭转应力和横向剪应力。
验证研究表明，使用VA-BATTS获得的结果与使用解析二维模型和非均匀三维有限元模型获得的结果高度一致。
使用二维分析可以准确计算平面外骨应力。材料不均匀性可能对预测应力有显著影响。在三点弯曲实验中，横向剪切可能对破坏潜能有重要贡献。该软件可在https://simtk.org/home/va-batts获取。
