使用基于计算机断层扫描的非线性有限元模型对老年女性腰椎强度进行体内评估。
In vivo assessment of lumbar vertebral strength in elderly women using computed tomography-based nonlinear finite element model.
作者信息
Imai Kazuhiro, Ohnishi Isao, Yamamoto Seizo, Nakamura Kozo
机构信息
Department of Orthopaedic Surgery, School of Medicine, Tokyo University, Bunkyo-ku, Tokyo, Japan.
出版信息
Spine (Phila Pa 1976). 2008 Jan 1;33(1):27-32. doi: 10.1097/BRS.0b013e31815e3993.
STUDY DESIGN
In vivo study of a computed tomography (CT)-based nonlinear finite element model (FEM).
OBJECTIVE
To establish an FEM with the optimum element size to assess the vertebral strength by comparing analyzed data with those obtained from mechanical testing in vitro, and then to assess the second lumbar (L2) vertebral strength in vivo.
SUMMARY OF BACKGROUND DATA
FEM has been reported to predict vertebral strength in vitro, but has not been used clinically.
METHODS
Comparison among the 3 models with a different element size of 1 mm, 2 mm, and 3 mm was performed to determine which model achieved the most accurate prediction. Vertebral strength was assessed in 78 elderly Japanese women using an FEM with the optimum element size.
RESULTS
The optimum element size was 2 mm. The L2 vertebral strength obtained with the FEM was 2154 +/- 685 N, and the model could detect preexisting vertebral fracture better than measurement of bone mineral density.
CONCLUSION
The FEM could assess vertebral strength in vivo.
研究设计
基于计算机断层扫描（CT）的非线性有限元模型（FEM）的体内研究。
目的
通过将分析数据与体外机械测试获得的数据进行比较，建立具有最佳单元尺寸的有限元模型以评估椎体强度，然后在体内评估第二腰椎（L2）椎体强度。
背景数据总结
据报道，有限元模型可在体外预测椎体强度，但尚未应用于临床。
方法
对单元尺寸分别为1mm、2mm和3mm的三种模型进行比较，以确定哪种模型能实现最准确的预测。使用具有最佳单元尺寸的有限元模型评估78名日本老年女性的椎体强度。
结果
最佳单元尺寸为2mm。通过有限元模型获得的L2椎体强度为2154±685N，该模型在检测既往椎体骨折方面比骨密度测量更具优势。
结论
有限元模型可在体内评估椎体强度。
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