Implicit Dynamic Analysis on Tightening Procedure of Cancellous Lag Screw Placement
10.16156/j.1004-7220.2018.02.05
- VernacularTitle:松质骨拉力螺钉紧固过程的隐式动力分析
- Author:
Yuxin LIU
1
;
Peidong SUN
2
;
Zhenyu BI
2
;
Jun OUYANG
2
Author Information
1. Department of Human Morphology, Ningbo College of Health Sciences
2. Guangdong Provincial Key Laboratory of Medical Biomechanics, Department of Anatomy, School of Basic Medical Sciences, Southern Medical University
- Publication Type:Journal Article
- Keywords:
cancellous lag screw;
screw-bone interface;
screw insertion;
tightening procedure;
implicit dynamic analysis
- From:
Journal of Medical Biomechanics
2018;33(2):E121-E125
- CountryChina
- Language:Chinese
-
Abstract:
Objective To simulate the tightening procedure of a cancellous lag screw by using the implicit dynamic analysis method, and to evaluate the stress distributions on the screw-bone interface. Methods Finite element models of a lag screw with the surrounding bone were developed, and the implicit solver was set up for implicit dynamic analysis on the tightening procedure of the lag screw. The mechanical properties of the screw-bone interface were also analyzed according to strain and stress distributions on the screw and the surrounding bone. Results The stress of the lag screw was mainly distributed in the proximal portion of the screw thread rod. The high-stress region of the bone around the screw was located outside the outer edge of the screw, and it was approximately equal to the depth of the thread. The area of high-stress distributions on the bone was the main region that resisted screw stripping. Conclusions The method of implicit dynamic analysis can accurately simulate the mechanical properties of the screw-bone interface during screw tightening. The discovery of high-stress distributions on the surrounding bone can help researchers to further understand and improve the stability of screw insertion.
