富士压敏胶片对人工胫股关节实际接触特性的影响
Effect of Fuji pressure sensitive film on actual contact characteristics of artificial tibiofemoral joint.
作者信息
Liau Jiann-Jong, Cheng Cheng-Kung, Huang Chun-Hsiung, Lo Wai-Hee
机构信息
Orthopaedic Biomechanics Laboratory, Institute of Biomedical Engineering, National Yang Ming University, No. 155, Sec. 2, Li-Nung St., Shih-Pai, Taipei 112, Taiwan.
出版信息
Clin Biomech (Bristol). 2002 Nov-Dec;17(9-10):698-704. doi: 10.1016/s0268-0033(02)00102-x.
OBJECTIVE
To investigate the effect of inserting a Fuji pressure sensitive film into an artificial tibiofemoral joint on the actual contact mechanics.
DESIGN
The experimental measurement and finite element analysis were used.Background. Although Fuji pressure sensitive film was widespread used for measuring the contact characteristics of artificial joint, how this measurement approaches actual contact characteristics has not yet been studied extensively.
METHOD
Two three-dimensional finite element models of an artificial tibiofemoral joint were constructed. The with-film-model was used to mimic the experimental setup and was verified by comparing the contact area and pressure on the simulated film calculated from finite element analysis to the measured one from the Fuji film (ultra-super low and medium grades) in the experimental test. Then the with-film-model was modified to the without-film-model in which the simulated film was removed. The contact characteristics on the film calculated from the with-film-model were represented to the measured one and the contact characteristics on the tibial component calculated from the without-film-model were represented to the actual one. The measured and actual contact characteristics were studied to investigate the effects of Fuji film on the actual contact characteristics in the tibiofemoral joint of knee prosthesis.
RESULTS
The contact characteristics calculated from with-film-model was reasonable agreement with measured one by Fuji film in the experimental test. The maximum difference is 13% in maximum contact pressure under a load of 3000 N. The maximum difference of contact area and pressure between the model simulating actual contact circumstance and the model with inserting a Fuji film between contacting surface are 2.4% and 14% respectively.
CONCLUSION
This study revealed that contact area and pressure of the tibiofemoral joint of knee prosthesis measured by Fuji pressure sensitive film could be simulated by finite element analysis. The measurement of contact area in the artificial joint by using ultra-super low grade Fuji film is overestimated its actual contact area by 1.2-2.4%, but the measurement of contact pressure by using medium grade Fuji film is underestimated its actual contact pressure by 8-14%.
RELEVANCE
This study revealed that the ultra-super low grade Fuji film is a reliable sensor to measure the contact area and the medium grade film would underestimate its actual contact pressure in the artificial tibiofemoral joint. This finding can provide a better understanding of the reliability of Fuji film to measure the contact characteristics of artificial joint in the experimental test.
目的
研究在人工胫股关节中插入富士压敏膜对实际接触力学的影响。
设计
采用实验测量和有限元分析。背景。尽管富士压敏膜广泛用于测量人工关节的接触特性，但这种测量方法如何接近实际接触特性尚未得到广泛研究。
方法
构建两个人工胫股关节的三维有限元模型。带膜模型用于模拟实验设置，并通过将有限元分析计算的模拟膜上的接触面积和压力与实验测试中富士膜（超超低和中等等级）测量的结果进行比较来验证。然后将带膜模型修改为无膜模型，其中去除模拟膜。将带膜模型计算的膜上接触特性与测量结果进行比较，将无膜模型计算的胫骨部件上的接触特性与实际情况进行比较。研究测量和实际接触特性，以研究富士膜对膝关节假体胫股关节实际接触特性的影响。
结果
在实验测试中，带膜模型计算的接触特性与富士膜测量的结果合理一致。在300 N载荷下，最大接触压力的最大差异为13%。模拟实际接触情况的模型与在接触表面之间插入富士膜的模型之间的接触面积和压力的最大差异分别为2.4%和14%。
结论
本研究表明，富士压敏膜测量的膝关节假体胫股关节的接触面积和压力可以通过有限元分析进行模拟。使用超超低等级富士膜测量人工关节的接触面积高估了其实际接触面积1.2 - 2.4%，但使用中等等级富士膜测量接触压力低估了其实际接触压力8 - 14%。
相关性
本研究表明，超超低等级富士膜是测量人工胫股关节接触面积的可靠传感器，而中等等级膜会低估其实际接触压力。这一发现可以更好地理解富士膜在实验测试中测量人工关节接触特性的可靠性。
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