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Aims. The work was aimed at the investigation of the diagnostic value of analysis of the optical density of bone regenerate under conditions of accelerated automatic lengthening of the lower leg. Materials and methods. A comparative analysis of the optical density (on the digitised X-ray images) of different areas of distraction regenerates of the tibia in 14 adult mongrel dogs aged 1 to 3 years at the stages of automatic lengthening of the lower leg with the Ilizarov technique, at a rate of 3 mm per day with preliminary bone damage by flexion osteoclasis (series I) and oblique osteotomy (series II). Results. The study revealed that the method of bone continuity by oblique osteotomy promotes more active osteogenesis in the distraction period and the support ability of the extremity within 14 days after dismantling the apparatus, which reduces the apparatus period by 16% compared with the series for which flexion osteoclasis was used. At the same time, signs of incomplete organotypic rearrangement of the newly formed diaphysis area, especially pronounced in series II, persist after 30 days of the apparatus-free period. Conclusions. When the optical density values of the distraction regenerate in intermediary and endosteal regions with two or more surfaces are more than 0.5 conditional units, and in the rest – not less than 0.33 conditional units, the onset of regenerate support ability was noted in both series. The resulting values can be criteria for dismantling the apparatus.

ANALYSIS OF OPTICAL DENSITY OF REGENERATE IN THE AUTOMATIC LOWER LEG LENGTHENING CONDITIONS WITH INCREASED RATE AT DIFFERENT METHODS OF BONE CONTINUITY