Finite element analysis to characterize how varying patellar loading influences pressure applied to cartilage: model evaluation.
Finite element analysis to characterize how varying patellar loading influences pressure applied to cartilage: model evaluation.
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DOI：
10.1080/10255842.2014.921814
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发表时间：
2015
影响因子：
1.6
通讯作者：
Elias JJ
中科院分区：
文献类型：
--
作者：
Shah KS;Saranathan A;Koya B;Elias JJ
一种有限元分析（FEA）建模技术已经被开发出来，以表征改变髌骨肌腱的方向如何影响髌骨股压力分布。为了评估该技术的准确性，我们从MRI图像中创建了五个膝关节的模型，这些膝关节先前在体外测试过，以确定腘绳肌负荷对髌骨股骨接触压力的影响。腘绳肌负荷增加了髌骨肌腱的外侧和后侧方向。每个模型分别在屈曲40°、60°和80°处加载，以股四头肌力向量表示实验加载条件。髌骨肌腱的方向是基于胫骨股骨对齐的实验测量来表示加载和卸载腘绳肌条件。与实验数据相似，有限元模型内模拟腿筋受力时，压力中心向外侧移动，最大侧压力增大。在单个屈曲角度进行配对t检验，发现压力中心和最大侧压力有显著差异（p < 0.05）。复制实验趋势的能力表明，FEA模型可以用于未来的研究，重点是确定与解剖或载荷变化或外科手术有关的髌骨肌腱方向的变化如何影响髌骨股压力分布。
A finite element analysis (FEA) modeling technique has been developed to characterize how varying the orientation of the patellar tendon influences the patellofemoral pressure distribution. To evaluate the accuracy of the technique, models were created from MRI images to represent five knees that were previously tested in vitro to determine the influence of hamstrings loading on patellofemoral contact pressures. Hamstrings loading increased the lateral and posterior orientation of the patellar tendon. Each model was loaded at 40°, 60° and 80° of flexion with quadriceps force vectors representing the experimental loading conditions. The orientation of the patellar tendon was represented for the loaded and unloaded hamstrings conditions based on experimental measures of tibiofemoral alignment. Similar to the experimental data, simulated loading of the hamstrings within the FEA models shifted the center of pressure laterally and increased the maximum lateral pressure. Significant (p < 0.05) differences were identified for the center of pressure and maximum lateral pressure from paired t-tests performed at the individual flexion angles. The ability to replicate experimental trends indicates that the FEA models can be used for future studies focused on determining how variations in the orientation of the patellar tendon related to anatomical or loading variations or surgical procedures influence the patellofemoral pressure distribution.