AUTOMATED 3-DIMENSIONAL FINITE-ELEMENT MODELING OF BONE - A NEW METHOD
AUTOMATED 3-DIMENSIONAL FINITE-ELEMENT MODELING OF BONE - A NEW METHOD
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DOI：
10.1016/0141-5425(90)90022-f
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发表时间：
1990-09-01
期刊：
影响因子：
--
通讯作者：
MOTE, CD
中科院分区：
文献类型：
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作者：
KEYAK, JH;MEAGHER, JM;MOTE, CD
骨的三维有限元应力分析是理解骨重建、评估骨折风险和设计假体的关键;然而，准确预测骨中应力场的成本和复杂性排除了该方法的常规使用。提出了一种新的自动生成患者特定的三维骨有限元模型的方法，它使用数字计算机断层扫描（CT）扫描数据来导出骨的几何形状，并估计其不均匀的材料特性。用户指定尺寸的立方体元素将自动定义，然后单独指定CT扫描衍生的材料属性。该方法被证明是通过预测的应力，应变和应变能在人体股骨近端在体内。从文献中提取步态站立相对应的三维载荷条件，并应用于模型。计算股骨颈内侧的最大主压应力为8-23 MPa。自动生成的额外的有限元模型与大量的元素被用来验证收敛的应变能。
Three-dimensional finite element stress analysis of bone is a key to understanding bone remodelling, assessing fracture risk, and designing prostheses; however, the cost and complexity of predicting the stress field in bone with accuracy has precluded the routine use of this method. A new, automated method of generating patient-specific three-dimensional finite element models of bone is presented-it uses digital computed tomographic (CT) scan data to derive the geometry of the bone and to estimate its inhomogeneous material properties. Cubic elments of a user-specified size are automatically defined and then individually assigned the CT scan-derived material properties. The method is demonstrated by predicting the stress, strain, and strain energy in a human proximal femur in vivo. Three-dimensional loading conditions corresponding to the stance phase of gait were taken from the literature and applied to the model. Maximum principal compressive stresses of 8-23 MPa were computed for the medial femoral neck. Automated generation of additional finite element models with larger numbers of elements was used to verify convergence in strain energy.