The destabilization dynamics of transpedicular spinal systems under the influence of mechanical loads

The strength as well as rigidity indices of the spine segments, subjected to osteosynthesis with a transpedicular spinal system, were studied experimentally with respect to vertical compressing and bending kyphosis-producing loads. A technique of modeling bending loads on spinal segments experimentally as well as a technique of modeling vertical loads on spinal segments experimentally was used for the studies. The anatomic preparations of the blocks of spinal segments T12-L2 and Т9-Lз were used with completely preserved discs and ligamentous structures, with the help of which instable injuries and transpedicular osteosynthesis (TPO) were simulated. Two stages of the destabilization process of "spinal segments - transpedicular metal fixator" system were singled out. Local destruction starts when the load is 1300-1400 N or 59,5-68 NM. Complete destabilization occurs for the loads of 2300-2500 N or 68-85 NM.