The authors substantiate the expediency of improving osteosynthesis with apparatuses of perosseous external fixation on the basis of electromechanical principles making use of statistically reliable results of 58 chronic experiments on animals, 27 stand studies on the tibia of cadavers and 207 dynamic clinical observations employing quantitative results of clinical, roentgenomorphometric, electrophysiologic, biomechanical and histomorphological studies. Optimal parameters of the rigidity of fixation for early restoration of the properties of elasticity and strength of the injured bone are determined. Dampered external osteosynthesis in the treatment of open comminuted fractures of the bones of the crus reduced the mean periods of in-patient treatment and consolidation of the fractures by 27-34. 5% and the frequency of complications and unsatisfactory outcomes by 75%.