Abstract
Aim. To identify the most effective constructive improvements in the bone-transport technique for the treatment of tibial defects in the experiment. Materials and methods. Certified Sawbones® composite bones were used, which correspond to the strength characteristics of real bone. Samples of fragment fixation were tested in different modes with different arrangements of elements of the ring fixators of the spoke-rod type. The testing machine TIRATEST-2151 No. 48/8.9 was used. During the test, the prototype was photographed at different load values. The images were digitally processed on a computer using a standard digital image management system. Results. The analysis of the displacement of bone fragments of different systems of ring fixators under different types of loads showed the following. The best results were obtained with the following arrangement: 1 spoke is in the plane of the ring, 2 spokes are at an angle to the plane Compared to the standard variant (2 crossed spokes in the plane of the ring), the compressive stiffness increased by 14.4%; bending - by 30.8% and torsion - by 4.8%. The use of the non-steroidal antiinflammatory drug dexketoprofen in the perioperative period allowed us to avoid the use of opioid anesthetics and minimize their negative effects. Conclusion. The experiment revealed that the best indicators of fixation rigidity are obtained with the variants of the spokes arrangement with a cross not only in the frontal but also in the sagittal planes. The clinical data obtained indicate the prospects of using improved ring fixators.