Abstract
Based on experimental studies, an analytical method is proposed for assessing the functional reliability of osteosynthesis systems. As criteria for the rigidity of osteosynthesis systems, displacements and mutual rotations of parts of bone fractures with fixation tools were used. The characteristics of the “bone with a fracture - fixation system”, necessary for calculations, determined experimentally from individual loads by compression, bending, and torsion of bone samples with simulated fractures and fixation tools.The characteristics of the plates for fixation of tibial fractures are determined, the level of allowable loads is calculated according to the combined action of compression, bending and torsion, and the areas of valid loads are determined.The proposed criteria for functional reliability make it possible, using simple tests and analytical calculations, to determine permissible load levels that do not lead to the occurrence of dangerous movements in the fracture area.
Highlights
During the knitting of bone fractures fixed by means of fixation, in most cases, disposable or reusable, mainly cyclic, loads occur
Any point under each of the surfaces corresponds to three values of loads P1, P2, and P3, the joint action of which leads to the occurrence of displacements and angles of rotation of fracture parts exceeding allowable: [Λ] < 1mm and [G] < 3°
To determine the allowable loads for later stages of fracture fusion, it is necessary to know the kinetics of changes in the deformation properties of bone tissue in the fracture region during its regeneration
Summary
During the knitting of bone fractures fixed by means of fixation, in most cases, disposable or reusable, mainly cyclic, loads occur. It is impossible to completely eliminate the dangerous displacements of individual points in the fracture area. These displacements can lead to improper reposition of fractures or slow down the process of fusion [1,2,3,4,5]. The practice of using various means of fixation of fractures (OS systems) has shown that one of the main functional indicators of these systems is the mutual linear displacements (Λ) of adjacent fracture points and the mutual rotation angles (G) of the fracture parts. It can be [9]: M – medial (located in the middle, closer to the longitudinal axis of the human body), L – lateral (located on the side, away from the longitudinal axis), V – ventral (located in front), D – dorsal (located behind) or other fracture points
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