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장영웅,권순영,김정성,유의식,이명철,임도형 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
Artificial composite tibiae have been widely used for mechanical evaluations of total knee arthoplasty (TKA) because of their low variability and wide availability. However, little information is available about whether artificial defects created during production significantly change the distribution of stress and micromotion within composite tibiae during a mechanical evaluation for TKA. The purpose of this study was to determine the effects of artificial defects on alterations in stress distribution and micromotion in composite tibiae during a mechanical evaluation for TKA using finite element (FE) analysis. The results showed that von Mises stresses near the artificial defect were approximately 1.6-fold higher than those on the same regions of composite tibiae without artificial defects. However, the difference in von Mises stresses decreased gradually beginning 3 mm from the center of the artificial defect. Micromotion in composite tibiae with artificial defects was similar to that of tibiae without artificial defects. These findings suggest that stress/strain on the cortical bone surface should be measured at least 3 mm from artificial defect centers but that micromotion is not affected by the artificial defects during a mechanical evaluation for TKA using composite tibiae.
모사경골 홀의 유무에 따른 경골내 응력 분포 패턴 및 기저판과의 Micromotion 차이 분석
장영웅(YoungWoong Jang),이재영(Jae Yeong Lee),염정현(Jung Hyun Yum),유의식(Oui Sik Yoo),김정성(Jung Sung Kim),임도형(Dohyung Lim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The use of artificial bones in implant testing has become popular due to their low variability and ready availability. But the hole, which is created during the production process in located proximal tibia, is apprehended to change stress distribution pattern and make stress concentration. The purpose of this study was to analysis of stress distribution pattern & micromotion deviation between cancellous bone and baseplate according to hole using finite element analysis (FEA). von Mises Stress around the hole at medial, lateral on the cortical surface was measured 63.1%, 66.6% higher than the filled hole model, respectively. But Micromotion between tibia and baseplate was similarly measured in the safe region(0~45μm). These results indicate that mechanical test with artificial bone should be considered the effect of poximal tibia hole.