Department of Integrated Systems Engineering, The Ohio State University, Columbus, Ohio, USA.
Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA.
Int J Numer Method Biomed Eng. 2022 Jun;38(6):e3600. doi: 10.1002/cnm.3600. Epub 2022 Apr 7.
We present the application of ReconGAN, introduced in a previous study, for simulating the vertebroplasty (VP) operation and its impact on the fracture response of a vertebral body. ReconGAN consists of a Deep Convolutional Generative Adversarial Network (DCGAN) and a finite element based shape optimization algorithm to virtually reconstruct the trabecular bone microstructure. The VP procedure involves injecting shear-thinning liquid bone cement through a needle in the trabecular region to reinforce a diseased or fractured vertebra. To simulate this treatment modality, computational fluid dynamics (CFD) is employed to predict the morphology of the injected cement within the bone microstructure. A power-law equation is utilized to characterize the non-Newtonian shear-thinning behavior of the polymethyl methacrylate (PMMA) bone cement during injection simulations. The CFD model is coupled with the level-set method to simulate the motion of the interface separating bone cement and bone marrow. After predicting the cement morphology, a data co-registration algorithm is employed to transform the CFD model to a high-fidelity continuum damage mechanics (CDM) finite element model of the augmented vertebra for predicting the fracture response. A feasibility study is presented to demonstrate the ability of this CFD-CDM framework to investigate the effect of VP on the mechanical integrity of the vertebral body in a cancer patient with a lytic metastatic tumor.
我们介绍了先前研究中引入的 ReconGAN 在模拟经皮椎体成形术 (VP) 操作及其对椎体骨折反应的影响中的应用。ReconGAN 由一个深度卷积生成对抗网络 (DCGAN) 和一个基于有限元的形状优化算法组成,用于虚拟重建小梁骨的微观结构。VP 手术涉及通过针将剪切稀化的液态骨水泥注入小梁区域,以增强患病或骨折的椎体。为了模拟这种治疗方式,我们采用计算流体动力学 (CFD) 来预测骨微结构内注入水泥的形态。我们使用幂律方程来描述聚甲基丙烯酸甲酯 (PMMA) 骨水泥在注射模拟过程中的非牛顿剪切稀化行为。CFD 模型与水平集方法耦合,以模拟分离骨水泥和骨髓的界面的运动。在预测水泥形态后,我们采用数据配准算法将 CFD 模型转换为增强椎体的高保真连续损伤力学 (CDM) 有限元模型,以预测骨折反应。本文提出了一项可行性研究,以证明该 CFD-CDM 框架有能力研究 VP 对患有溶骨性转移性肿瘤的癌症患者椎体机械完整性的影响。