Effects of Locking Screws with Different Head Angles on Mechanical Properties of Screw-Plate System
10.16156/j.1004-7220.2020.02.15
- VernacularTitle:锁定螺钉不同头部角度对钉板系统力学性能的影响
- Author:
Dongsheng JI
1
;
Yun ZHENG
2
;
Erfan HUO
2
;
Hongyan XING
1
Author Information
1. Tianjin Key Laboratory of Integrated Design and On-Line Monitoring for Light Industry Food Machinery and Equipment, School of Mechanical Engineering, Tianjin University of Science and Technology
2. Tianjin Naton Institute of Medical Technology
- Publication Type:Journal Article
- Keywords:
locking screw;
screw-plate system;
cantilever bending;
mechanical properties
- From:
Journal of Medical Biomechanics
2020;35(2):E223-E227
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the effects from head angle and locking times of locking screws on mechanical properties of the screw-plate system, so as to provide a theoretical basis for doctors to select appropriate locking screws and master the locking times in clinical surgical procedure. Methods Locking screws with different head angles were selected to match with locking compression plates in the case of different locking times, and cantilever bending method was used to compare the differences of mechanical properties in each group. Results There were significant differences in failure load and bending stiffness between locking compression plate and locking screw with different head angles (P<0-05). The mechanical properties of the screw-plate system with the best locking degree were optimum. There was no significant difference between 3 time-locking and 1 time-locking (P>0-05). The failure modes of locking screw with different head angles and different locking times were different, and the failure mode of locking screw had a positive correlation with its head angle and locking times. Conclusions The differences in mechanical properties between locking screw with different head angles and locking compression plate cannot be neglected. It is suggested that doctors should choose locking screw and locking compression plate with the best locking degree in clinical procedure, and choose the right torque wrench to lock in multiple times if necessary, thus to prevent screw loosening from affecting recovery of the patients.
