ANALYSIS OF THE STRESS-STRAIN STATE OF THE TIBIAL MODEL IN CASE OF ITS FRACTURE IN THE MIDDLE THIRD WITH VARIOUS TYPES OF OSTEOSYNTHESIS UNDER CONDITIONS OF INCREASING BENDING LOAD

Abstract

.9% of disabilities. The goal was to conduct a comparative analysis of the stress-strain state of models of the tibia with its fracture in the middle third with different options of osteosynthesis under the influence of bending load depending on the patient's weight. The model simulated a tibial fracture in the middle third and three types of osteosynthesis using an external fixation device (EFD), a bone plate, and an intramedullary rod. The models were studied at 700 N and 1200 N bending loads. Usually, under a bending load, the maximum stress magnitude is determined in the distal part of the tibia. When using EFD osteosynthesis, the maximum stress level is observed in the distal fragment of the tibia. The maximum stresses are determined in the fracture zone during osteosynthesis with a bone plate. Osteosynthesis with an intramedullary rod provides the lowest stress level in the fracture zone. An increase in the load value to 1200 N leads to a rise in the stress values in all model elements. The worst stress level indicators in the fracture zone and the metal structure were determined using a bone plate. With the help of EFD, osteosynthesis ensures a relatively low stress level in the fracture zone; it is worth noting the lowest stress level on the device itself. The lowest stress indicators in the fracture zone and the proximal fragment of the tibia are determined when using osteosynthesis with an intramedullary rod.