Journal of Biomedical Engineering Research (대한의용생체공학회:의공학회지)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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Influence of Malalignment on Tibial Post in Total Knee Replacement Using Posterior Stabilized Implant

슬관절 전치환술에서 후방 안정 임플란트의 오정렬이 경골 기둥에 미치는 영향

  • Kim, Sang-Hoon (School of Advanced Technology, Kyung Hee University) ;
  • Ahn, Ok-Kyun (Department of Orthopedic Surgery, Kyung Hee Medical School) ;
  • Bae, Dae-Kyung (Department of Orthopedic Surgery, Kyung Hee Medical School) ;
  • Kim, Yoon-Hyuk (School of Advanced Technology, Kyung Hee University) ;
  • Kim, Kyung-Soo (Institute of Natural Sciences, Kyung Hee University) ;
  • Lee, Soon-Gul (School of Advanced Technology, Kyung Hee University)
  • 김상훈 (경희대학교 테크노공학대학) ;
  • 안옥균 (경희대학교 정형외과) ;
  • 배대경 (경희대학교 정형외과) ;
  • 김윤혁 (경희대학교 테크노공학대학) ;
  • 김경수 (경희대학교 자연과학종합연구) ;
  • 이순걸 (경희대학교 테크노공학대학)
  • Published : 2007.02.28
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Abstract

Recently, it has been reported that the posterior stabilized implant, which is clinically used for the total knee replacement (TKR), may have failure risk such as wear or fracture by the contact pressure and stress on the tibial post. The purpose of this study is to investigate the influence of the mal alignment of the posterior stabilized implant on the tibial post by estimating the distributions of contact pressure and von-Mises stress on a tibial post and to analyze the failure risk of the tibial post. Finite element models of a knee joint and an implant were developed from 1mm slices of CT images and 3D CAD software, respectively. The contact pressure and the von-Mises stress applying on the implant were analyzed by the finite element analysis in the neutral alignment as well as the 8 malalignment cases (3 and 5 degrees of valgus and varus angulations, and 2 and 4 degrees of anterior and posterior tilts). Loading condition at the 40% of one whole gait cycle such as 2000N of compressive load, 25N of anterior-posterior load, and 6.5Nm of torque was applied to the TKR models. Both the maximum contact pressure and the maximum von-Mises stress were concentrated on the anterior-medial region of the tibial post regardless of the malalignment, and their magnitudes increased as the degree of the malalignment increased. From present result, it is shown that the malalignment of the implant can influence on the failure risk of the tibial post.

Keywords

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