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Resumo

Influence of various factors (conditions) on strength and stiffness of the biomechanical system of 'machine-bone' was studied using application of extrafocal rod osteosynthesis in cases of long bone fractures. The problem solution of stability of the concerned biomechanical system in which the interaction of 'bone-apparatus' is presented in the form of an elastic system consisting of two absolutely rigid links (broken bone), interconnected by elastically deformable elements (unit with titanium rods) having one (the flexural) degree of freedom is shown. Factors influencing the strength characteristics of the web have been identified on the basis of the equation obtained in the course of solving the stability problem. The modeling relationship of the strength characteristics of the rod from its own weight of a person (the load), the rod length and angle of introduction pegs to the longitudinal axis of the bone in the form of full factorial experiment allowed to analyze the significance of their impact. Numerical analysis of the dependence P = f (0, C, l) has shown that the greatest impact on output parameter P (load) has a C (coefficient of rigidity). The significance of impact of this factor exceeds the value of the impact of Θ and l about 6 and 2.6 times respectively. The results are based on previously completed scientific and theoretical research system of 'bone-apparatus' strength and stability and laboratory and practical results.

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