Biomechanical study of finite element analysis in the fixation of horizontal osteotomy genioplasty
10.3760/cma.j.cn114453-20220302-00053
- VernacularTitle:有限元分析用于水平截骨颏成形术固定方式的生物力学研究
- Author:
Weihao ZHOU
1
;
Ziwei GUO
;
Xiangdong QI
Author Information
1. 南方医科大学珠江医院整形美容科，广州 510280
- Keywords:
Genioplasty;
Finite element analysis;
Internal fixation;
Stress distribution;
Biomechanics
- From:
Chinese Journal of Plastic Surgery
2023;39(1):19-27
- CountryChina
- Language:Chinese
-
Abstract:
Objective:Three-dimensional reconstruction and finite element analysis were used to investigate the outcomes of different fixation methods on horizontal osteotomy genioplasty and to identify the fixation method with best biomechanics.Methods:The skull spiral CT data of a patient with chin deformity were collected. The mandible three-dimensional model and internal fixation devices were reconstructed by Mimics, Geomagic Studio, Solidworks and Ansys Workbench software. The surgical osteotomy and four internal fixation methods (simple H-shaped titanium plate; 3 lag screws; H-shaped titanium plate combined with bilateral straight titanium plates; H-shaped titanium plate combined with bilateral lag screws) were simulated. The difference of deformation and stress distribution in each fixation under the same load were tested by finite element analysis.Results:The results of H-shaped titanium plate combined with bilateral lag screws fixation were the most balanced, the overall displacement was minimal (0.033 2 mm), the stress concentration of fixation material and free bone was 59.79 MPa and 4.69 MPa, respectively, and the regional stress was small[comparison of the equivalent stress of fixation material between groups, except that it was similar to the three lag screw fixation methods ( P>0.05), it was significantly smaller than the other two fixation methods ( P<0.01); comparison of the equivalent stress of free bone segment between groups, except that it was similar to the simple H-shaped titanium plate fixation method ( P>0.05), it was significantly smaller than the other two fixation methods ( P<0.05)]. Conclusion:The method of H-shaped titanium plate combined with bilateral lag screws fixation in horizontal osteotomy genioplasty has small deformation, which is not easy to cause deformation and fracture of fixation materials, and has superior mechanical properties. It is an appropriate method for clinical application.
