[Morpho-functional characteristic of the lumbar area of the human vertebral column in the individuals with various degrees of lumbar lordosis (on the basis of three-dimensional computer modeling)].

This investigation was aimed at the evaluation of the borders of individual variability of the human lumbar spine lordosis. 224 nuclear magnetic tomograms of persons of mature age were analyzed using morphometric, statistical methods, method of three-dimensional (3D) computer modeling and finite-element analysis. During the investigation, a hardware-software complex for morphometric research was created together with the new method of development of 3D computer models of the lumbar spine. The application of 3D modeling allowed to extend the knowledge of human spine biomechanics. Tensions and deformations were calculated in all lumbar vertebrae and intervertebral disks on the basis of spine 3D models developed. Finite-element analysis proved that a normal angle of lumbar lordosis was optimal for the transmission of the adequate compression loads, while the extreme forms of individual variability (high degrees of hyper- and hypolordosis), by changing the geometry of the vertebral column, result in the decrease of the functionality of this system.

[The growth, chemical composition and strength properties of the long tubular bones in the skeleton of white rats under the influence of low-energy laser radiation]. / Rost, khimicheskii sostav i prochnostnye svoistva dlinnykh trubchatykh kostei skeleta belykh krys pod vliianiem nizkoénergeticheskogo lazernogo izlucheniia.

Influence of He-Ne laser on skeleton bones of rats was studied. Morphometrical, histological, methods were applied; the chemical content was established. The conclusion is made that laser can be used for the optimisation of growth, mineralization and stability of skeleton bones.

[Features of growth and chemical composition of various skeletal bones of albino rats as affected by x-ray and laser irradiation]. / Nekotorye osobennosti rosta i khimicheskogo sostava razlichnykh kostei skeleta belykh krys pod vozdeistviem rentgenovskogo i lazernogo izlucheniia.

The aim of present investigation was to demonstrate the growth peculiarities of skeletal bones different types and to observe the changes in their mineral content under the influence of X-rays and laser radiation. It was found that laser radiation causes insignificant hypohydration and increase of mineral component, which was accompanied by increase of calcium and phosphates content. The bones of animals which were treated with X-rays diminish their growth in all directions, accumulate sodium, while their calcium and phosphate content was decreased.