| Objective:By testing multiaxial multi-plane adjustable unilateral external fixator and traditional AO external fixation of femoral shaft fracture model in short oblique axial compression, torsion levels, three-point bending biomechanical properties, compared to more unilateral summary flat-screen multi-axis adjustable external fixator biomechanics, provide a reliable theoretical basis for further clinical research. Methods:Select the length of the canal diameter value of similar specimens preserved adult femur 10, the general observation and X-ray to exclude deformities, bone, etc., excluding muscle and other soft tissue. Left and right sides of the same corpse femur samples were randomly divided into multi-level multi-axis adjustable unilateral external fixator(experimental group), traditional AO external fixator(control group). Caused by human femur 1/3 segment short oblique fracture, installation of external fixation, external fixation of the femur has been marked installed in the universal testing machine, torsion testing machine, respectively, axial compression Zwick materials testing machine, horizontal reverse three-point bending test; test machine processor computer and capture images recorded each of the experimental data, and the data collected input tester comes with the computer, using SPSS18.0 software for statistical analysis of all data, determining the mechanical characteristics of the two internal fixation evaluate its significance. Results:1.Load displacement between the experimental and control groups obtained by P t test measurement data> 0.05, two sets of experimental data were not significantly different, indicating that the new multi-plane unilateral external fixator and AO external fixator stability in the axial direction there is no significant difference on the clinical application of standards in line.2. The torsion test between the experimental and control groups by t test between the two groups of measurement data obtained in multi-level multi-sided torque of 10 Nm, 20 Nm, when 30 Nm, no significant difference P> 0.05, the test group and the control group, indicating no axis adjustable external fixation with AO external fixator on what anti-rotation capability significantly different, but when torque is 40 Nm, the control group than in the experimental group firm stability, multi-plane multiaxial can prove unilateral tuning external fixator more traditional AO external fixator somewhat less torsional capacity at this time, in order to reverse angle torque 40 Nm experimental group increased 8.68%.3. The load- bending displacement in the experimental group and the control group in 100 N, 200 N, 400 N between the measurement data obtained by the two groups P t test> 0.05, no significant difference was observed experimental data on the new multi-plane unilateral external fixator There was no significant difference in the AO external fixator in the side and back and forth in the above bending strength, but in the case of 600 N, the stability of the control group was significantly better than the experimental group, prove that traditional AO external fixator when fully load Strong resistance to bending than the new unilateral external fixator. Conclusion:1. unilateral multi-planar multi-axis adjustable external fixator to achieve a needle priority, flexible structure of space. Bone fracture fixation device can test object position on the line anatomic reduction, improved clinical operations Get started, easy to adjust during treatment.2. The following unilateral multi-planar multi-axis adjustable external fixator doubled weight(600N) axially fixed to achieve strong, has a good stable mechanical structure, in lateral bending stress due to the use of "Social Day" structure, multi-plane after pinning strength to resist bending and twisting slightly less, at 2/3(400N) times the weight still maintain stability.3.In order to enhance bony unilateral external fixator plane multi-axis adjustable stability, but also continue to improve its unilateral structure, making it more stable. |
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