Estimation of the effects of inset heights and slit configurations in an acetabular cup on the pull-out behavior of an a
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ORIGINAL ARTICLE
Estimation of the effects of inset heights and slit configurations in an acetabular cup on the pull-out behavior of an artificial hip joint with a structure for preventing dislocation using finite element analysis Yuki Kawamura 1 & Mitsushi Ohmasa 2 & Takayuki Kobayashi 3,4 & Yoshihito Matsufuji 5 & Makoto Saito 5 & Yoshinori Uwa 6 & Saiji Washio 7 & Ei Yamamoto 8 Received: 23 October 2019 / Accepted: 10 July 2020 # International Federation for Medical and Biological Engineering 2020
Abstract Joint dislocation is a critical problem of total hip replacement. We have newly proposed an artificial hip joint with a structure that prevents dislocation. The proposed joint has a simple form with a femoral head partially covered with an acetabular cup. In the present study, the effects of inset heights and slit configurations of the cup on the pull-out forces of the joint were evaluated using finite element analysis. Joint models with different inset heights and those with or without a slit in the cup were used for the analyses to estimate the pull-out forces of the joint. In the case without the slit, the maximum pull-out force of the joint with 1.0 and 1.5 mm of the inset height was approximately 12 and 40 N, respectively. In the case of 1.0-mm inset height, the maximum force of the joint with and without the slit was approximately 9 and 12 N, respectively. These results reveal that the maximum force is markedly changed by the inset height and is moderately affected by the slit. Thus, we can gain insights into a strategy to optimally design an artificial joint in which dislocation does not occur easily.
Keywords Artificial hip joint . Prevention of joint dislocation . Pull-out force . Finite element method . Prosthetic design
1 Introduction * Ei Yamamoto [email protected] 1
Major of Biological System Engineering, Graduate School of Biology-Oriented Science and Technology, Kindai University, Kinokawa, Wakayama 649-6493, Japan
2
Department of Human Factors Engineering and Environmental Design, Faculty of Biology-Oriented Science and Technology, Kindai University, Kinokawa, Wakayama 649-6493, Japan
3
Animal Clinic Kobayashi, Fukaya, Saitama 366-0813, Japan
4
Department of Environmental and Preventive Medicine, Kanazawa University, Kanazawa, Ishikawa 920-0934, Japan
5
Shimizutech CO., LTD., Kobe, Hyogo 651-2241, Japan
6
Uwa Technical Computing INC., Kobe, Hyogo 655-0851, Japan
7
Mechanical Engineering Dept. I, CAE Div. I, CAE BU., Cybernet Systems CO., LTD., Osaka, Osaka 541-0053, Japan
8
Department of Biomedical Engineering, Faculty of Biology-Oriented Science and Technology, Kindai University, Kinokawa, Wakayama 649-6493, Japan
An effective treatment for hip osteoarthritic patients is total hip arthroplasty (THA) [1]. THA is a surgical procedure in which a painful osteoarthritic hip joint is replaced with artificial components. The artificial hip joint is mainly composed of three parts: stem, femoral head, and acetabular cup. The stem is a metallic part made of titanium or cobalt chro
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