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2018 Vol.31, Issue 1 Preview Page
Analysis of Contact Pressure for Material Combination in Unicompartmental Knee Implant

반치환 무릎 인공관절에서의 재료조합에 따른 접촉압력 분석

Tae-Heon Noh1
,
Heoung-Jae Chun1†
노 태 헌1
,
전 흥 재1†
1Department of Mechanical Engineering, Yonsei Univ., Seoul, 03722, Korea
1연세대학교 기계공학부
†Corresponding author: +82-2-2123-4827; hjchun@yonsei.ac.kr
2018. pp. 23-29
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Abstract

In knee implants, contact pressure has a significant effect on wear. In this study, finite element analysis is performed using the knee implant model developed in the previous research. The contact pressures for a total of 10 knee implant materials combinations were analyzed using the combinations actually used in research and industry. In order to calculate the contact pressure, The load was applied when the flection angle of knee was 30°, 45° and 60°. The result of contact pressure revealed the smallest contact pressure in the titanium alloy-UHMWPE combination. In the case of UHMWPE, contact pressure did not change much with any material used in the femur. Compared the combination with the largest contact pressure and the smallest contact pressure, the difference was 0.77%. On the other hand, Carbon / PEEK composites showed 5.3% difference when the contact pressure was the largest and the smallest. It can be seen that when the Carbon / PEEK composite material is used as the bearing part, the material of the femoral part affects the wear. This study will contribute to the prediction of knee implant wear and minimization of wear.

Keywords
unicompartmental knee implant
finite element analysis
contact pressure
material combination

무릎 임플란트에서 접촉압력이 마모에 큰 영향을 미친다. 본 연구에서는 본 연구기관에서 개발한 무릎 임플란트 모델을 이용하여 유한요소해석을 하였다. 연구와 산업에서 실제로 사용하는 조합을 이용하여 총 10가지의 무릎 임플란트의 재료조 합에 대한 접촉압력을 분석하였다. 무릎이 30도, 45도 60도 기울어져있을 때의 하중을 가하여 접촉압력을 구하였다. 접촉압 력을 계산한 결과 티타늄합금-UHMWPE 조합에서 가장 작은 접촉압력이 나왔다. UHMWPE의 경우 대퇴골부에 어떠한 재 료를 사용하여도 접촉압력이 크게 변하지 않았다. 접촉압력이 가장 큰 조합과 작은 조합을 비교하였을 때 0.77% 차이를 보 였다. 반면에 Carbon/PEEK 복합재료의 경우 접촉압력이 가장 큰 경우와 작은 경우를 비교하였을 때 5.3% 차이를 보였다. 이를 통해 Carbon/PEEK 복합재료를 베어링부로 사용할 경우 대퇴골부의 재료가 마모에 영향을 미침을 알 수 있다. 본 연구 는 무릎 임플란트 마모예측과 마모를 최소화 연구에 도움이 될 것이라 생각한다.

키워드
반치환 무릎 인공관절
유한요소해석
접촉압력
재료조합
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Information
  • Publisher :Computational Structural Engineering Institute of Korea
  • Publisher(Ko) :한국전산구조공학회
  • Journal Title :Journal of the Computational Structural Engineering Institute of Korea
  • Journal Title(Ko) :한국전산구조공학회 논문집
  • Volume : 31
  • No :1
  • Pages :23-29
  • Received Date : 2017-08-30
  • Revised Date : 2017-12-20
  • Accepted Date : 2017-12-21
  • DOI :https://doi.org/10.7734/COSEIK.2018.31.1.23
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