The Memory Manipulator Biomechanics Reasearch

Objective:12fresh femur specimens with periosteum were randomly divided into test group and control group, after the model biomechanical testing, evaluation of biomechanical differences between a long oblique fracture of femur fixed by the memory manipulator and normal human femur.Methods:From August2010to October2010, using a standard biomechanical testing, observation of the object is12fresh femur specimens with periosteum, evenly divided between men and women, aged from20to40years old, average age is33.5years,by the X ray, CT and other mechanical testing to rule out degenerative mutation, cancer, metabolic such as disease and deformity..which were randomly divided into experimental group and control group, six in each group, experimental group with femoral shaft oblique fracture caused by a long wire saw (fracture line more than5cm), which were fixed by the memory manipulator; specimens were respectively tested by electronic universal testing machineof CSS-44200and Torsion Testing Machine of NJ-50on whole load, axial load, torsional load, record After each level of load and displacement of the femur torsion angle, calculated by analysis of the overall strain, axial compression stiffness and torsional stiffness,Spss17.0software package was used to analysis the experimental data obtained.Results:The axial compression test:within the normal physiological load, experimental group fixed by the memory manipulator slightly larger than normal femur strain,but the overall bending strength had no significant differences (P>0.05); the group fixed by memory manipulator and the control group were significantly difference (P<0.05);Conclusion:The test data show that the memory manipulator has a good bio-mechanical properties, can be achieved sufficient biomechanical strength, good stability, has a good results on femoral shaft oblique fracturer.