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基于符合中国第50百分位男性体征的志愿者下肢计算机断层扫描(CT)图像建立下肢长骨有限元模型，并参考尸体长骨动态三点弯曲实验进行实验重构，验证了该模型的有效性。基于开发的模型，研究几何长度、长骨类型和建模中是否考虑骨髓等对长骨生物力学响应的影响。结果表明：与第5百分位女性下肢长骨相比，更长、更粗壮的第50百分位男性长骨在受到冲击时拥有更好的韧性。同时，由于长骨两端相较于中心部位更为宽厚且长骨中部截面类似于三角形，在受到冲击时会出现应力集中现象，因此长骨两端相较于中心处承受冲击的能力更强，比胫骨、下肢长骨中股骨承受冲击的能力更好，强度最高。相较于骨髓腔采用松质骨填充的实心结构股骨模型，中空结构的股骨模型承受冲击的能力较弱，但其韧性较好。在未来模型构建过程中需考虑骨髓对长骨生物力学响应的影响。
Abstract：Based on the computed tomography(CT)images of volunteers' lower limbs which meet the characteristic of 50thpercentile male in China,a finite element model of lower limb long bones was established,and the experimental reconstruction was carried out to validate the effectiveness of the model with reference to the dynamic three-point bending test of cadaver long bones in this current study. Based on the developed model,the effects of geometric length,long bone type,and whether bone marrow is considered in modeling on the biomechanical response of long bones were studied. The results showed that compared with the long bones of the lower limbs of the 5 th percentile female,the long bones of the 50 th percentile male were found to have stronger toughness when impacted. At the same time,the two ends of the long bone are wider than the central part for long bones,and the cross section of the middle part of the long bone is similar to a triangle,stress concentration occurred when it was impacted. Therefore,the two ends of the long bone had stronger impact resistance than the central part,and the femur had better impact resistance and the highest strength than the tibia. Compared with the solid structure femoral model with cancellous bone filling in the marrow cavity,the hollow structure femoral model had weaker impact resistance,but the femur had better toughness. In the future model construction process,the influence of bone marrow on the biomechanical response of long bones needs to be considered.
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基本信息:
DOI：10.13364/j.issn.1672-6510.20240042
中图分类号:R318.01
引用信息:
[1]崔世海,张城铭,李海岩,等.几何特征对长骨生物力学响应的影响[J].天津科技大学学报,2025,40(06):67-75.DOI:10.13364/j.issn.1672-6510.20240042.
基金信息:
国家重点研发计划项目（2018YFC0807203-1）
2024-11-06
2024-11-06
2024-11-06