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The biomechanical effect of the collar of a femoral stem on total hip arthroplasty
Insu Jeon(전인수),Ji-Yong Bae(배지용),Jin-Hong Park(박진홍),Taek-Rim Yoon(윤택림) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
To investigate the biomechanical effect of collars, finite element analyses are carried out through two hip joints that are implanted using collared and collarless stems, respectively, and an intact hip joint model. For the analyses, biological materials, such as, the sacrum, coxal bone, and the cancellous and cortical bones of a femur, are reconstructed based on X-ray CT images taken from a 27-year-old woman. The geometric solid models are fabricated using the reconstructed models. For the solid models of hip joint prostheses, CAD data of the PerFix collarless and collared prostheses of Japan Medical Materials Co., Ltd. are used. The finite element models are constructed on the solid models and then, the computations are carried out considering an applied load of 1647.5N, which is three times of the woman’s weight. From the results, it is found that a collar with perfect calcar contact prevents stem subsidence and decreases the proximal lateral gap and the lateral tilting of the stem. Therefore, it can impart reasonable biomechanical stability for THA. However, its low load transmission ability and increased stem tilting effect due to the imperfect contact between the collar and the calcar are found to be serious problems that need to be solved. Results of clinical follow-up are presented for supporting the computational results.
닫힌 셀 구조 Al 발포 재료의 압축 거동에 대한 수치해석
전인수(Insu Jeon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The finite element method is applied to analyze the deformation mechanisms in the closed-cell Al foam under the compression. The modeling of the real cellular structure proceeds with the concept of the reverse engineering. First of all, the small, 10×10×10㎣ sized specimens of the closed-cell Al foam are prepared. The micro focus X-ray CTsystem of SHIMADZU Corp. is used to scan the full structures of the specimens. The scanned structures are converted to the geometric surfaces and solids through the software for 3-D scan data processing, RapidFormTMof INUS Tech. Inc. Then the solid meshes are directly generated on the converted geometric solids for the finite element analysis. The large elastic-plastic deformation and 3-D contact problems for the Al cellular material are considered. The clear and successful analysis for the deformation mechanisms in the closed-cell Al foam is carried out through the comparison of the numerical results in this research with the referred experimental ones.