| 足底外侧垫对距下关节接触特征影响的有限元分析 |
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投稿时间：2016-03-22
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| 作者 | Author | 单位 | Address | E-Mail |
| 周恩昌 |
ZHOU En-chang |
聊城市第二人民医院, 山东 临清 252601 |
The Second Hospital of Liaocheng, Linqing 252601, Shandong, China |
878390121@qq.com |
| 唐萍 |
TANG Ping |
聊城市第二人民医院, 山东 临清 252601 |
The Second Hospital of Liaocheng, Linqing 252601, Shandong, China |
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| 朱传英 |
ZHU Chuan-ying |
聊城市第二人民医院, 山东 临清 252601 |
The Second Hospital of Liaocheng, Linqing 252601, Shandong, China |
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| 刘士明 |
LIU Shi-ming |
聊城市第二人民医院, 山东 临清 252601 |
The Second Hospital of Liaocheng, Linqing 252601, Shandong, China |
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| 期刊信息：《中国骨伤》2017年，第30卷，第1期，第38-41页 |
| DOI：10.3969/j.issn.1003-0034.2017.01.009 |
| 基金项目: |
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中文摘要:
目的：建立下肢骨骼的三维有限元模型，并用此模型分析佩戴不同角度足底外侧垫后距下关节接触特征的变化。
方法：利用逆向建模技术，将正常成人志愿者下肢三维CT数据，在Mimics 10.0、Geomagic Studio 6.0软件中对相关组织进行重建，并和ProE 5.0中设计出足底外侧垫的计算机模型导入Hyperwork 10.0软件中进行网格划分，赋予材料属性，在ABAQUS 6.9中添加受力状况，进行有限元分析。
结果：建立下肢骨骼及足部软组织三维有限元模型，共95 365个节点、246 238个单元。站立时距下关节的接触特征为后关节面的接触面积大于前中关节面，峰值应力集中在后关节面的前外侧部分，平均应力值（3.85±1.03）MPa。与0°模型比较4°、8°、12°和16°模型的前、中、后距下关节的接触面积都相应减小，前者|r|=0.964，P=0.008；后者|r|=0.978，P=0.002，均存在显著相关性。0°模型距下关节等效应力均值（3.07±1.14）MPa至（3.85±1.03）MPa，各区域之间差异无统计学意义。与0°模型相比，8°模型中前、中关节面等效应力均值显著减小（P<0.05），同时后距下关节面的峰值应力显著增大（P<0.05）。在12°模型中峰值应力会在此基础上急剧增大至（10.51±3.53）MPa，与8°模型比较差异有统计学意义（P<0.05），16°模型中虽然峰值应力略有增大，但与12°模型比较差异无统计学意义。
结论：佩戴足底外侧垫后获得的距下关节外翻是以距下后关节面应力集中为代价，选择8°倾斜角在提供适当外翻力矩同时不会造成载荷过度集中，临床上不应盲目增加倾斜角度，以免继发足踝部并发症。 |
| 【关键词】距下关节 足底外侧垫 有限元分析 足 |
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| Finite element analysis on the effect of lateral wedge insole intervention on the contact characteristics of the subtalar joint |
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ABSTRACT
Objective: To establish a three-dimensional finite element model of the lower limb bones, and investigate the changes of the contact characteristics of the subtalar joint after using laterally wedge insole intervention.
Methods: Using the reverse modeling technology, the lower limb bones of normal adult volunteers was scanned by CT.Mimics 10.0 and Geomagic Studio 6.0 software were used to reconstruct the 3D morphology of bones and external soft tissue of the feet.The laterally wedge insole was designed in ProE 5.0.And then all the models were imported into Hyperwork 10.0 and meshed, and given the material properties.The finite element analysis was carried out in ABAQUS 6.9.
Results: A three-dimensional finite element model of the lower extremity was established, which was consisted of 95 365 nodes and 246 238 elements.The contact area of the standing state of the lower joint was larger than that of the anterior middle joint surface.The peak stress was concentrated in the anterior lateral part of the posterior articular surface, and the average stress value was (3.85±1.03) MPa.Compared with the model of 0°, the contact area of the subtalar joint was reduced accordingly.There was a significant correlation between anterior middle joint|r|=0.964, P=0.008, and posterior articular|r|=0.978, P=0.002.The equivalent stress of 0° model distributed from (3.07±1.14) MPa to (3.85±1.03) MPa, which had no statistically difference.Compared with the 0° model, the equivalent stress of the anterior and middle joint surfaces of the 8° model was significantly reduced (P<0.05), but the peak stress of the posterior articular surface was significantly increased (P<0.05).In the 12° model, the peak stress was sharply increased to (10.51±3.53) MPa.Compared with 8° model, there was no statistically difference (P<0.05).Although the peak stress was slightly increased in 16° model, but compared with 12° model, there was no statistically differences (P>0.05).
Conclusion: Although a certain valgus can be obtained in subtalar by wearing LWI, the result comes at the cost of the stress concentration on posterior surface.Through this study, we can find that LWI with 8° tilt angle could provide appropriate valgus moment without causing excessive concentration.Therefore, in order to avoid secondary ankle complications, we should not increase the tilt angle blindly. |
| KEY WORDS Subtalar joint Laterally wedge insole Finite element analysis Foot |
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| 引用本文，请按以下格式著录参考文献： |
| 中文格式: | 周恩昌,唐萍,朱传英,刘士明.足底外侧垫对距下关节接触特征影响的有限元分析[J].中国骨伤,2017,30(1):38~41 |
| 英文格式: | ZHOU En-chang,TANG Ping,ZHU Chuan-ying,LIU Shi-ming.Finite element analysis on the effect of lateral wedge insole intervention on the contact characteristics of the subtalar joint[J].zhongguo gu shang / China J Orthop Trauma ,2017,30(1):38~41 |
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