• Title/Summary/Keyword: Artificial hip joint

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Friction and wear properties of carbon fiber reinforced epoxy composite for the artificial hip joint application (인공고관절 모사조건하에서의 탄소섬유 복합재료의 마찰 및 마모 특성)

  • 송영석;윤재륜
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 1999.11a
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    • pp.239-241
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    • 1999
  • Recently, the friction and wear behaviors of UHMWPE, ceramic and metal is being researched actively for the use as an artificial hip-joint. In this study, because of good wear properties of carbon fiber, we made experiments about the friction and wear of carbon fiber reinforced epoxy composite under the lubricative and the dry condition. The possibilities of carbon-carbon composite for the artificial hip joint application was studied from this results.

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A Study on the Contact Stress Analysis of the Artificial Hip Joint Using Finite Element Method (유한요소법을 이용한 인공 고관절의 접촉응력 해석에 관한 연구)

  • 김청균;윤종덕
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 1996.10a
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    • pp.189-194
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    • 1996
  • The modern orthopaedics frequently uses the total hip replacement in the artificial hip joint. The wear in this joint requires the re-replacement of the hip joint beacuse it is under the severe load and friction conditions. To solve these problems the previous studies have been mainly focused on the development of the new materials. The research of new material, however, needs much time and effort since it should be experimented for its bio-compatibility, friction, and wear characteristics. To reduce the work, in this study, the finite element analysis is applied to find the new combination of the materials in the total hip replacement which has the excellent contact characteristics. The finite element uses MARC and the 5-node aximetric element. The results show that in case of acetabulum UHMWP has good characteristics, in femoral head, the $Al_2O_3$, and in stem, Ti6Al4V.

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Contact Stress Analysis of Artificial Hip Joints Using Finite Element Method (유한요소법을 이용한 인공 고관절의 접촉응력 해석에 관한 연구)

  • Kim, Chung-Kyun;Yoon, Jong-Deok
    • Tribology and Lubricants
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    • v.13 no.1
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    • pp.82-87
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    • 1997
  • The modern orthopaedics frequently uses the total hip replacement in the artificial hip joint. The wear in this joint requires a re-replacement of hip joints because it is under the severe load and friction conditions. To solve these problems the previous studies have been mainly focussed on the development of new materials. The research of new materials, however, needs much time and effort since it should be experimented for its bio-compatibility, friction, and wear characteristics. To reduce the work, in this study, the finite element analysis is applied to find new combinations of bio-materials in the total hip replacement which has the excellent contact characteristics. A non-linear FEM program MARC with 5-node axisymmetric element was used for analyzing the contact stresses between the hip joints. The computed results show that in case of acetabulum UHMWP has good characteristics, in femoral head, $Al_2O_3$, and in stem, Ti6Al4V.

A study on the fitness measurement of artificial femur through medical image processing (의료영상처리를 이용한 인공고관절 정합도 측정 방법에 관한 연구)

  • 김용호;김중규
    • Proceedings of the IEEK Conference
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    • 1999.11a
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    • pp.1071-1074
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    • 1999
  • In this paper, we studied a computer based three dimensional implantation system of artificial hip joint. The system can be utilized for doctors to select a suitable artificial femur which is best-fit for the patient and to find out the optimal implanting position as well. We proposed a new numerical index to measure the fitness between the artificial hip joint and the patient's femur. The proposed fitness index accounts for the variance of the distance between the outer contours of artificial hip joint and the femur in addition to the conventional area comparison. A few simulation are run to show results of fitness measurement and compared to the conventional method.

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Robot assisted THA surgery using gauge based registration (게이지 정합 방법을 이용한 소형 인공고관절 수술로봇의 개발)

  • Shin, Ho-Chul;Park, Young-Bae;Yoon, Yong-San;Kwon, Dong-Soo;Lee, Jung-Ju;Won, Chung-Hee
    • Proceedings of the KSME Conference
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    • 2001.06c
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    • pp.482-484
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    • 2001
  • In orthopedics, hip arthroplasty is the operation that replaces damaged hip joint to artificial joint. In hip arthroplasty, quite better result can be achieved if robot is applied to machine cavity in bone, especially when cementless stem is used. So several kinds of robots were introduced for hip arthroplasty, but they used MRI, CT Scan, vision analysis and real time tracking of bone position for registration of robot. To overcome shortage of conventional robot surgery, gauge based registration method was proposed and small robot was designed. In this method, small robot is mounted on femur, and its position is determined by gauge registration method. Operation procedure was performed on model femur and result was analyzed. This robotic hip surgery system is expected to more adaptable in operation room.

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Effect of Artificial Leg Length Discrepancy on 3D Hip Joint Moments during Gait in Healthy Individuals (건강한 성인에서 인위적 다리길이 차이가 보행 중 3차원 엉덩관절 모멘트에 미치는 효과)

  • Jo, Min-Ji;Kim, Dong-Hyun;Han, Dong-Wook;Choi, Eun-Jin;Kim, Ye-Seul;Kim, Yong-Wook
    • PNF and Movement
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    • v.17 no.3
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    • pp.391-399
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    • 2019
  • Purpose: This study investigated the three-dimensional moment values of the hip joint for subjects with artificial leg length alterations and subjects with unaltered leg lengths. Methods: Forty-two healthy adults (8 men, 34 women) participated in this study. The selected subjects were able to walk normally, had less than a 1 cm leg length discrepancy, and were instructed to wear shoes that fit their feet. The study participants performed 8 dynamic gait trails to measure the hip joint moment using a three-dimensional motion analysis system. Kinetic and dynamic three-dimensional gait analysis data were collected from infrared cameras, and a force plate was used to standardize the weight of each subject. Results: There were significant correlations between the differences in the leg length discrepancy during right extension, right flexion, right internal rotation, and left extension in hip joint moments (p<0.05). There were significant correlations between the differences in shoe conditions during left extension, right flexion, right extension, and right internal rotation in the hip moments (p<0.05). Conclusion: This study suggests that a leg length discrepancy can affect hip joint moment, which may further exacerbate musculoskeletal disorders, such as osteoarthritis in lower extremity joints. Therefore, further studies should be conducted to verify the impact of clinical interventions on differences in hip joint moment values to correct leg length discrepancies and prevent osteoarthritis in lower extremity joints.

THE EFFECTS OF MESH STYLE ON THE FINITE ELEMENT ANALYSIS FOR ARTIFICIAL HIP JOINTS

  • Shin, Jae-Min;Lee, Dong-Sun;Kim, Sung-Ki;Jeong, Da-Rae;Lee, Hyun-Geun;Kim, Jun-Seok
    • Journal of the Korean Society for Industrial and Applied Mathematics
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    • v.15 no.1
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    • pp.57-65
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    • 2011
  • In this paper, a good quality mesh generation for the finite element method is investigated for artificial hip joint simulations. In general, bad meshes with a large aspect ratio or mixed elements can give rise to excessively long computational running times and extremely high errors. Typically, hexahedral elements outperform tetrahedral elements during three-dimensional contact analysis using the finite element method. Therefore, it is essential to mesh biologic structures with hexahedral elements. Four meshing schemes for the finite element analysis of an artificial hip joint are presented and compared: (1) tetrahedral elements, (2) wedge and hexahedral elements, (3) open cubic box hexahedral elements, and (4) proposed hexahedral elements. The proposed meshing scheme is to partition a part before seeding so that we have a high quality three-dimensional mesh which consists of only hexahedral elements. The von Mises stress distributions were obtained and analyzed. We also performed mesh refinement convergence tests for all four cases.

Comparative Analysis of the Stress and Strain of Material for Revision Total Hip Replacement (고관절 재치환술시 재료의 응력과 변형률의 비교 분석)

  • Shim D.H.;Kim J.H.;Ko S.H.;Kim K.H.;Kim D.Y.;Choi M.J.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.511-512
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    • 2006
  • According to development of medical science and engineering, people has made efforts to solve tile discomfort of body accident as well as the life span. Many cases that reduce pain of a hip joint or limitation of motion using Revision Total Hip Replacement are getting increased. However it has not proved which material is the most appropriate. Scientists are still studying about materials of the artificial joint. In accordance with advance of science, the materials are Betting better. Recently, when Revision Total Hip Replacement is performed, typical materials are Ti-alloys Ceramics. We have studied materials of artificial joints and analyzed which one is better for human's body.

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Structural Analysis and Design of Artificial Hip Joint by Using Finite Element Method (유한요소법을 이용한 인공 고관절의 역학적 거동 해석 및 설계)

  • 정재연;황운봉;하성규
    • Composites Research
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    • v.12 no.5
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    • pp.98-109
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    • 1999
  • An investigation has been performed to develop a nonlinear finire element method for the analysis of the long-term behavior of an artificial hip joint. The three dimensional multi-layered brick element is used to analyze the design performances of hip prodtheses with various materials and the thick laminated composite hip prostheses with various layup sequences. The used element can accommodate the varying material properties of the element and allow the ply-drop-off along the eleement edge. The nonlinear finite element analysis program has been verified by the comparison with the exact solution of the bean problem subjected to uniaxial loading. By using the program, the density changes and strength ratios of artificial hip joint are calculated according to the hip prosthesis materials and the layers of composite hip prosthesis. The numerical results are easily applied to evaluate design performances of a hip prosthesis, and decrease the difficulty and time of hip prosthesis design.

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