A Study On Design And Biomechanics Of Enhanced Bioceramic Rod

Objects:Through designing and testing physical and chemical properties and biomechanical properties of the Enhanced Bioceramic Rod, we can provid the theoretical basis for Clinical application to prevent the collapse of the necrotic femoral head.Methods:1. Designing the Enhanced Bioceramic Rod.2. Testing physical and chemical properties and biomechanical properties of the Enhanced Bio-ceramic Rod.3. Completing the Bio-mechanical tests and analyzing the me-chanical indicators.12 fresh frozen corpses were randomly divided into four groups, each group has three. one side of the femurs was randomly going core decompression and implanted Enhanced Bioceramic Rod, the other side was going simple core decompression, core decompression and implanted fibula, nomal Femoral head respectively as a control. The longitudinal stress testing was applied to the Femoral head of the four groups, and recording respectively the vertical displacement, Maximum load and Stiff-ness curve in detail. using SPSS 16.0 software to analyze the experimental data.Results:1. On the basis of the enhanced bioceramic, we design the Enhanced Bioceramic Rod.2. The porous parts is 75%±10%, spherical diameter is about 500μm, pore diameter connecting the spherical cavity is about 100μm. The Spherical cavity is Interlinked fully; The surface of the porous matrix distributes many micro-pores(pore size is about 0.2～1μm).3. Biomechanical test results show that the maximum load and stiffness of the Enhanced Bioceramic Rod were significantly higher than those of simple core decompression group (P<0.05); The maximum load and stiffness of the Enhanced Bioceramic Rod were significantly lower than the fibula and normal femoral head group (P<0.05); The maximum load and stiffness of the fibula group compared with the normal femoral head shows no significant difference (P>0.05).Conclusions:1. The part of the dense and porous ceramic has a good combination under the electron microscope, there is no interface was completely metallurgical bonding and chemical bonding approach. The dense fracture pattern of the Enhanced Bioceramic Rod shows that the bonding strength is high.2. The data of the Enhanced Bioceramic Rod shows that this structure will be conducive to material degradation, cell adhesion, nutrient transfer and the formation of new bone.3. Biomechanical test results show that the maximum load and stiffness of the Enhanced Bioceramic Rod were significantly higher than those of simple core decompression group (P<0.05); the maximum load and stiffness of the Enhanced Bioceramic Rod were significantly lower than the fibula and normal femoral head group (P<0.05); The maximum load and stiffness of the fibula group compared with the normal femoral head shows no significant difference (P>0.05).The data of this experimental shows that:the Enhanced Bioceramic Rod can provide a mechanical support for femoral head and prevent the collapse of femoral head.