Chinese Journal of Tissue Engineering Research ›› 2012, Vol. 16 ›› Issue (26): 4770-4775.doi: 10.3969/j.issn.1673-8225.2012.26.005

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In vivo finite element modeling and mechanical analysis of artificial hip joint

Xu Ling-jun1, Zhu Hai-bo2, Zhang Yin-wang2, Zhu Jian-min2, Zhong Wu-xue2, Zhang Hao2, Chen Yun3   

  1. 1Clinical College of Jiangsu University, Zhenjiang 212013, Jiangsu Province, China;
    2Department of Orthopedics, Shanghai Xuhui Central Hospital, Shanghai 200031, China;
    3Institute of MED-X of Shanghai Jiao Tong University, Shanghai 200031, China
  • Received:2011-11-10 Revised:2011-12-21 Online:2012-06-24 Published:2013-11-02
  • Contact: Zhu Jian-min, Master’s supervisor, Professor, Department of Orthopedics, Shanghai Xuhui Central Hospital, Shanghai 200031, China zhujm55@xh.sh.cn
  • About author:Xu Ling-jun★, Studying for master’s degree, Physician, Clinical College of Jiangsu University, Zhenjiang 212013, Jiangsu Province, China xljjiangsu@live.cn

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Abstract:

BACKGROUND: Finite element analysis has been widely used for the study of human’s hip replacement. It is a useful method to demonstrate the stress distribution before or after hip replacement.
OBJECTIVE: To analyze the mechanical distribution of the prosthesis and the femur by the three-dimension finite element model after hip replacement based on the CT scanning image, in order to provide the method for the evaluation of femoral prosthesis in vivo.
METHODS: One patient with uncemented prosthesis replacement has been scanned with 64-slice CT. With the help of three-dimensional modeling software, a three-dimensional finite element model of femur was established. 1 500 N was loaded on the femoral head prosthesis, and the stress distribution of the prosthesis and the femur was analyzed, and then compared with the in vitro model and finite element model of the normal femur.
RESULTS AND CONCLUSION: The three-dimensional finite element model has been established using the CT scanning images after the total hip arthroplasty. After loading force on the model, we found that the stress mainly distributed on the 1/3 superior part of femur, on the prosthesis where neck and stem integrated, lateral of the stem and the area contact with prosthesis distal end, and that was the true reaction for the stress distribution after replacement. It indicates that in vivo hip joint modeling is superior to in vitro modeling; in vivo modeling of artificial hip prosthesis is a new method to evaluate the prosthesis without changing the position of the prosthesis.

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