Chinese Journal of Tissue Engineering Research ›› 2021, Vol. 25 ›› Issue (3): 356-361.doi: 10.3969/j.issn.2095-4344.2985

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Finite element analysis of locking screw assisted acetabular cup fixation

Chen Lu, Zhang Jianguang, Deng Changgong, Yan Caiping, Zhang Wei, Zhang Yuan   

  1. Department of Orthopedics, Affiliated Hospital of North Sichuan Medical College, Nanchong 637000, Sichuan Province, China
  • Received:2020-02-27 Revised:2020-03-05 Accepted:2020-04-18 Online:2021-01-28 Published:2020-11-16
  • Contact: Chen Lu, Master, Associate professor, Master’s supervisor, Department of orthopedics, Affiliated Hospital of North Sichuan Medical College, Nanchong 637000, Sichuan Province, China
  • About author:Chen Lu, Master, Associate professor, Master’s supervisor, Department of orthopedics, Affiliated Hospital of North Sichuan Medical College, Nanchong 637000, Sichuan Province, China

Abstract: BACKGROUND: The main reason for the failure after total hip arthroplasty is aseptic loosening of the prosthesis. The traditional acetabular cup fixation method is still controversial in maintaining the initial stability of the acetabular cup. It is a new method that can be considered to further improve the fixation method of the acetabular cup to increase its stability.
OBJECTIVE: To analyze the feasibility and superiority of locking screw assisted acetabular cup fixation. 
METHODS: The digital model of acetabular cup and screws were reconstructed and assembled by software Solidworks. The Von-Mises and shear stress of the acetabular cup and screw by three methods, including acetabular cup, acetabular cup with ordinary cancellous bone screw, and acetabular cup with locked cancellous bone screw, were compared.
RESULTS AND CONCLUSION: (1) The finite element model of the established acetabular cup and screw had excellent geometric similarity and could be used for finite element analysis. (2) The acetabular cups with locking screws received less Von-Mises and shear stress than other methods. (3) The locking screws could bear higher stress than ordinary screws and effectively dispersed the shear stress of acetabular cups. (4) It is concluded that the combination of locking screws to fix the acetabular cup can effectively prevent the instability of the acetabular cup and the loosening of the prosthesis; it can better provide stability for the acetabular cup and the mechanical environment that the bone tissue grow in the later stage. The acetabular cups with locking screws have obvious advantages than other ordinary screw, which has the limited bearing capacity and low anti-acetabular cup shear force.

Key words: joint, arthroplasty, acetabulum, locking screw, screw, acetabular cup, finite element analysis, biomechanics

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