Modeling and finite element analysis of a new acetabular revision component with three wings

Wenhui MA; Xuemin Zhang; Jifang Wang; Shushan Shi

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Modeling and finite element analysis of a new acetabular revision component with three wings

VernacularTitle:三翼髋臼假体有限元模型的建立及其力学分析
Author: Wenhui MA ; Xuemin ZHANG ; Jifang WANG ; Shushan SHI
Publication Type:Journal Article
Keywords: Acetabulum; Prostheses and implants; Reoperative; Finite element analysis
From: Chinese Journal of Orthopaedics 2010;30(8):778-782
CountryChina
Language:Chinese
Abstract: Objective To analyze and evaluate a new acetabular revision component with three wings. Methods The finite-element models of a new acetabular component and acetabulum with bone loss were established to calculate the interface stresses during a normal gait cycle with use of the finite-element formulations. Results The finite-element analysis demonstrated that stress and strain at the interfaces of bone-shell and metal-polyethylene liner had the same direction of change but no remarkable difference between them. In the study, the result indicated increased contact stresses with an increased joint load and orientation. The peak stress was tested at the second stage of gait cycle. The stress of wings increased gradually from rim to root. Its peak stress that was significantly lower than yield force of the Co-Cr alloy was at the joint between the wing and the shell. The stress of graft had the same change rule as the joint force. The part of graft near to acetabular component was subjected to higher stress conditions. Conclusion The hip forces can transfer from acetabular component and implant to acetabulum. The result of the finite-element analysis underlined the importance of wings of the new acetabular component. The wing can help to improve the antitorsion ability of acetabular component and to minimize its aseptic loosening rate. Therefore, based on results of this study and clinical application, the acetabular component with wings is known a viable means for acetabular revision in the presence of bone loss. But further research is needed as to this acetabular component.