Finite element modeling of proximal femur with quantifiable weight-bearing area in standing position
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(2020) 15:384
RESEARCH ARTICLE
Open Access
Finite element modeling of proximal femur with quantifiable weight-bearing area in standing position Peng Yang1,2†, Tian-Ye Lin1,2†, Jing-Li Xu1, Hui-Yu Zeng1, Da Chen3, Bing-Lang Xiong1, Feng-Xiang Pang1, Zhen-Qiu Chen2, Wei He2, Qiu-Shi Wei2* and Qing-Wen Zhang2*
Abstract Background: The positional distribution and size of the weight-bearing area of the femoral head in the standing position as well as the direct active surface of joint force can directly affect the result of finite element (FE) stress analysis. However, the division of this area was vague, imprecise, and un-individualized in most studies related to separate FE models of the femur. The purpose of this study was to quantify the positional distribution and size of the weight-bearing area of the femoral head in standing position by a set of simple methods, to realize individualized reconstruction of the proximal femur FE model. Methods: Five adult volunteers were recruited for an X-ray and CT examination in the same simulated bipedal standing position with a specialized patented device. We extracted these image data, calculated the 2D weightbearing area on the X-ray image, reconstructed the 3D model of the proximal femur based on CT data, and registered them to realize the 2D weight-bearing area to 3D transformation as the quantified weight-bearing surface. One of the 3D models of the proximal femur was randomly selected for finite element analysis (FEA), and we defined three different loading surfaces and compared their FEA results. Results: A total of 10 weight-bearing surfaces in 5 volunteers were constructed, and they were mainly distributed on the dome and anterolateral of the femoral head with a crescent shape, in the range of 1218.63–1, 871.06 mm2. The results of FEA showed that stress magnitude and distribution in proximal femur FE models among three different loading conditions had significant differences, and the loading case with the quantized weightbearing area was more in accordance with the physical phenomenon of the hip. Conclusion: This study confirmed an effective FE modeling method of the proximal femur, which can quantify the weight-bearing area to define a more reasonable load surface setting without increasing the actual modeling difficulty. Keywords: Hip joint, Finite element modeling, Weight-bearing area, Image registration
* Correspondence: [email protected]; [email protected] † Peng Yang and Tian-Ye Lin are co-first authors. 2 The Third Affiliated Hospital of Guangzhou University of Chinese Medicine, Joint Orthopedics, Guangzhou, People’s Republic of China Full list of author information is available at the end of the article
© The Author(s). 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate
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