Biomechanical analysis of interbody device in calf corpectomy model [Dana omurgasi korpektomi modelinde i̇nterkorporal cihazin biyomekanik analizi]

Introduction: the aim of this study is to evaluate the biomechanical properties of the interbody device which is used in thoracic trauma,infection and tumor surgery in valf model. the comparison in between anterior interbody application,anterior,posterior and anterior posterior instrumentation combinations is also stated. the statical applications of interbody device in conditions with anterior interbody applications,anterior,posterior and anterior+posterior instrumentation combinations are done through the gain of stiffness and displacement. in this biomechanical study,instrument stiffness and displacement values are measured and evaluated under axial loading. materials and method: in 7 calf spine,interbody device applications,thoracolumbar anterior and posterior instrumentations were held. the measurements were done in the following order: interbody device,interbody device + thoracolumbar anterior instrumentation,interbody device + thoracolumbar posterior instrumentation,interbody device + thoracolumbar anterior instrumentation + thoracolumbar posterior instrumentation. stiffness and deformations were measured under 500 newton in each specimen. the loading device was shimadzu autograph ag-50 kng. the statistical analysis was done with wilcoxon signed rank test. results: the mean axial stiffness values obtained in 7 experiments in calf spine model were as follows: icd: 9958 n/mm,icd + a: 21062 n/mm,icd + p: 11877 n/mm,icd + a + p: 22301 n/mm. interbody device application demonstrated higher stiffness values when compared to anterolateral plate and screw-rod applications. there was no significant difference between circumferential stabilisation,interbody device application and anterolateral screw-rod instrumentation. conclusion: in this study; it has been shown that,interbody device supplies adequate stiffness in calf spine model. this stiffness increases in anterolateral instrumentation. the benefit of posterior pedicle screw rod system to interbody device + anterolateral screw -rod system was statistically significant.