The biomechanical substantiation of the number of connecting rods between the supports of the Ilizarov fixator

The aim of the study was to substantiate the optimal number of rods in the device with wires and half-pins experimentally. It has been established that, when connecting rods between the closed ring supports increase in number, osteosynthesis rigidity does not change beginning from three connecting rods. The decrease of the connecting rods in number from three to two results in the decrease of fixation rigidity of bone simulator with the device; the presence of the fourth connecting rod between the non-closed supports on the basis of 3/4 ring leads to 18-22% increase of fixation rigidity; the presence of the fourth connecting rod between the supports based on 1/3 ring does not lead to osteosynthesis rigidity increase. The comparative assessment of the maximal loss of osteosynthesis rigidity time is shown when the llizarov fixator was used and also a combined device with wires and half-pins.