Liau J J, Hu C C, Cheng C K, Huang C H, Lo W H
Orthopaedic Biomechanics Laboratory, Institute of Biomedical Engineering, National Yang Ming University, No. 155, Sec. 2, Li-Nung St., Shih-Pai, ROC, Taipei, Taiwan.
Clin Biomech (Bristol). 2001 Feb;16(2):160-6. doi: 10.1016/s0268-0033(00)00040-1.
To investigate the influence of inserting a Fuji pressure sensitive film between the tibiofemoral joint of knee prosthesis on actual contact characteristics.
A finite element analysis was used to investigate the alteration of contact characteristics of the tibiofemoral joint due to inserting a pressure sensitive film between the contacting surfaces.
The discrepancy between actual contact behaviors of tibiofemoral joint of knee prosthesis and the measurement using Fuji pressure sensitive film was not discussed extensively. The change of direct contact circumstance of the tibiofemoral joint due to inserting a pressure sensitive film was not well reported.
A two-dimensional finite element model of the tibiofemoral joint of knee prosthesis in the sagittal plane was constructed. Four different radii of the femoral component were used to investigate the conformity effect. Two-layers of plane strain element were used to model the pressure sensitive film. The influence of inserting a pressure sensitive film on the actual contact characteristics was analyzed by comparing the results of the change in contact radius.
Inserting a pressure sensitive film between contacting surfaces would disturb the original contact behaviors, especially in the lowest conformity design. The maximum difference of contact radius between the model simulating actual contact circumstance and the model with inserting a pressure sensitive film between contacting surface was 77% in the lowest conformity condition at the smallest load.
This study proposes a quantitative analysis of contact characteristics in the tibiofemoral joint of knee prosthesis between the models with and without inserting a pressure sensitive film into the contact surface. The measurement of contact area in artificial tibiofemoral joints by using Fuji pressure sensitive film is always overestimated its true contact area by 14-77%.
This study revealed the measurement of contact characteristics of artificial tibiofemoral joints by using Fuji pressure sensitive film which depends on not only the applied load, but also the conformity and material properties of the contact surface. Therefore, the information of the conformity and material properties of the contact surface should be provided as well as the applied load wherever a measurement of contact characteristics using Fuji pressure sensitive film is analyzed and interpreted.
探讨在膝关节假体胫股关节间插入富士压敏膜对实际接触特性的影响。
采用有限元分析来研究由于在接触表面间插入压敏膜而导致的胫股关节接触特性的改变。
膝关节假体胫股关节的实际接触行为与使用富士压敏膜测量结果之间的差异尚未得到广泛讨论。关于插入压敏膜导致胫股关节直接接触情况的变化也鲜有报道。
构建膝关节假体胫股关节矢状面的二维有限元模型。使用四种不同半径的股骨部件来研究匹配效应。采用两层平面应变单元对压敏膜进行建模。通过比较接触半径变化的结果来分析插入压敏膜对实际接触特性的影响。
在接触表面间插入压敏膜会干扰原始接触行为，尤其是在匹配度最低的设计中。在最小载荷下的最低匹配条件下，模拟实际接触情况的模型与在接触表面间插入压敏膜的模型之间接触半径的最大差异为77%。
本研究对在接触表面插入和未插入压敏膜的膝关节假体胫股关节接触特性进行了定量分析。使用富士压敏膜测量人工胫股关节的接触面积时，其真实接触面积总是被高估14% - 77%。
本研究揭示了使用富士压敏膜测量人工胫股关节接触特性不仅取决于施加的载荷，还取决于接触表面的匹配度和材料特性。因此，在分析和解释使用富士压敏膜测量接触特性的结果时，应同时提供接触表面的匹配度和材料特性信息以及施加的载荷。
