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The Correlation Analysis through the Contact Stress and the Curvature Radius according to Flexion Angle for the Design of Unicompartment Knee Replacement

반치환 슬관절의 설계 평가를 위한 굴곡각도에 따른 곡률반경과 접촉응력의 상관도 분석

  • Lee, YongKyung (Department of Biomedical Materials, Konyang University) ;
  • Yoo, OuiSik (Central R&D center, CORENTEC CO., LTD.) ;
  • Kim, JaeWon (Central R&D center, CORENTEC CO., LTD.) ;
  • Lim, Dohyung (Department of Mechanical Engineering, Sejong University) ;
  • Jung, TaeGon (Medical Device Development Center, Osong Medical Innovation Foundation) ;
  • Kim, JungSung (Department of Biomedical Materials, Konyang University)
  • 이용경 (건양대학교 의료신소재학과) ;
  • 유의식 ((주)코렌텍 중앙기술연구소) ;
  • 김재원 ((주)코렌텍 중앙기술연구소) ;
  • 임도형 (세종대학교 기계공학과) ;
  • 정태곤 (오송첨단의료산업진흥재단 첨단의료기기개발지원센터) ;
  • 김정성 (건양대학교 의료신소재학과)
  • Received : 2016.11.08
  • Accepted : 2016.12.28
  • Published : 2016.12.31

Abstract

Conformity between the femoral component and tibial insert within the knee replacement may be measured in frontal or sagittal view, and shows differences in the curvature radius of the femoral component depending on the flexion angle, i.e., curvature radius has a complex effect on contact stress. Therefore, it is essential to confirm how the curvature radius effects contact stress, and provide an important variable to reduce contact stress. This study correlated contact stress with curvature radius measured in frontal and the sagittal views and confirmed the effect of curvature radius for assessment of the Newly Designed Unicompartment Knee Replacement (NDUKR). Finite element models were constructed for NDUKR and $Zimmer^{(R)}$ Unicompartment High Flex Knee Replacement system (ZUKR), incorporating the curvature radius as measured in either frontal or sagittal view. The femoral component had 1200N of compressive load applied approximately 1.65xbody weight. Contact stress was predicted at flexion angles $0^{\circ}C$, $30^{\circ}C$, $60^{\circ}C$, $90^{\circ}C$ and $120^{\circ}C$, for NDUKR: 42, 47.7, 47.7, 51.2, and 54.1 MPa, and ZUKR: 41.2, 49.5, 53.2, 54.3, and 57.4 MPa, respectively. Correlation analysis showed the influence of curvature radius measured from the sagittal view was larger than for frontal view.

Keywords

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