Three series of experiments in dogs were performed. In one series subtrochanteric osteotomy of the femur using compression osteosynthesis with Г-shape plate was carried out, in the other - osteotomy of the diaphysis of either the femur or tibia using osteosynthesis with straight plate, and in the third (control) series osteotomy was not performed and the plate was implanted under compression or without it. Bone tissue microcirculation was studied in the enlightened sections by authors’ method using Indian ink-gelatine mixture; morphologic examinations were carried out on eosin-hematoxylin stained specimens. Presice effect of osteogenesis induction in the place of plate contact with the metal fixative was observed and it was most pronounced around the screw thread, that was considered as a factor of the additional osteosynthesis fixation. During the formation of primary consolidation, the delay in angioarchitectonics retardation of the compact bone under the plate was noted. Microcirculatiry bed response was of universal addoptive pattern and showed the formation of extravascular microcirculation at early stages.