Репозиторий Университета

© 2020 Elsevier Ltd The purpose of this study is the mechanical characterization of the mid-to- old-age human anterior lens capsules (ALCs) obtained by capsulorhexis using Atomic Force Microscopy (AFM) and a nanoindenter at different spatial scales. The dependencies on the human age, presence or absence of pseudoexfoliation syndrome (PEX), and application of trypan blue staining during the surgery were analyzed. The measurements on both the anterior (AS) and epithelial (ES) sides of the ALC were conducted and the effect of cells present on the epithelial side was carefully accounted for. The ES of the ALC had a homogenous distribution of the Young's modulus over the surface as shown by the macroscale mapping with the nanoindenter and local AFM indentations, while the AS was more heterogeneous. Age-related changes were assessed in groups ranging from the mid-age (from 48 years) to old-age (up to 93 years). We found that the ES was always stiffer than the AS, and this difference decreased with age due to a gradual decrease in the Young's modulus of the ES and an increase in the modulus of the AS. No significant changes were found in the mechanical properties of ALCs of PEX patients versus the PEX-free group, as well as in the properties of the ALC with and without trypan blue staining.

© 2018, Dynasty Publishing House. All rights reserved. Literature data about biomechanical foundations of the development of foot pathologies in children and adolescents are analysed. The development and formation of anatomical structure of the foot as a flexible movable arch, and biomechanical specificities in human standing and walking are also considered. As has been noted, correct development and formation of the anatomical skeleton of the foot, its ligamentous-muscular apparatus and sole skin ensure its reliable functioning. As has been pointed out, understanding of the biomechanics of walking is extremely important for an orthopaedist when choosing a method of foot pathology correction, in particular, in rehabilitation of paediatric patients. The main functions of the foot have been specified – spring, balance, and propulsion. Most methods of diagnosing foot injury and disease, as a rule, are aimed at evaluating the spring function of the foot based on analysis of its anatomical structures. The conclusion has been made that the problem of correction and management of foot dysfunctions and pathologies should be solved as early as in childhood, which is possible only on the basis of complex consecutive implementation of a number of measures that include: diagnostics, choice of a way of correction, design and manufacturing of an individual orthosis (conservative method) or surgical treatment. Large-scale clinical testing of modern methods of podology and biomechanics in diagnosing and treatment of foot pathologies and correction of disorders of its stance function will contribute to progress in solving such a significant medico-social problem as foot disorders in childhood and adolescence.