Substantiation of the optimal length and shape of the plate for the correction of congenital funnel-shaped deformity of the chest
Keywords:chest, pectus excavatum, thoracoplastyka, mathematical modeling
Background. In thoracoplasty of congenital funnel-shaped deformity of the chest (СFSDC), the method according to D. Nuss is common, when the correction of the deformation is carried out by the retrosternal plate. However, the selection of the plate still focuses on the anatomical size of the chest and does not take into account the individual parameters of deformation of СFSDC, namely the width and depth of the cavity, and the shape of the plate is given imperatively, which affects treatment results. Purpose of the work: to carry out mathematical substantiation of the optimal dimensions of the length and shape of the plate for thoracoplasty СFSDC depending on the individual size of the funnel-shaped deformation of the patient to achieve maximum correction. Materials and methods. To mathematically substantiate the parameters of geometrization of anatomical and structural-qualitative features of funnel-shaped deformation of the thorax, calculations of the magnitude of loads on the arch-plate and elements of the sternocostal complex were performed. Results. It was found that the result of the study justifies the study of geometrization of anatomical and structural-qualitative features of chest deformation and determination of geometric parameters of the plate-arc according to individual anatomical dimensions of width and depth of СFSDC. The research served as a basis for the development of a method for modeling the thoracic arch-plate for the correction of funnel-shaped deformation of the chest. Conclusions. Mathe-matical modeling, research and calculations of indivisible multi-support plate with different span lengths as in thoracoplasty, allows to reduce the maximum torque Mmax by 11 %, by reducing the span lengths. Based on mathematical calculations, the optimal length of the plate L is the size 2D, where D is the width of the funnel-shaped deformation and is the distance between the support ribs, the height of the arc bend at the level of the support ribs should be 1/2 H, where H is equal to the funnel depth. The obtained data are of great practical importance in determining the optimal length and shape of the plate in thoracic thoracoplasty СFSDC.
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