Effect of bilocal distraction osteosynthesis on arbitrary bioelectric activity of humeral muscles in patients with achondroplasia

Abstract

The data are given, obtained during study of the effect of humeral segment elongation by the method of bilocal distraction osteosynthesis on characteristics of total electromyogram of humeral muscles, reflecting the dynamics of functional condition of the elbow muscular antagonists. 17 patients with achondroplasia at the age of 9-16 were used for the study after simultaneous elongation of both humeri with mean lengthening of 9,7 ± 1,5 cm or 67,2% of initial length. Mean amount of amplitude and frequency of oscillations in the conditions of "arbitrary maximal stress" functional test was calculated for analysis of total electromyogram parameters. The analysis of the obtained data demonstrated, that in the shor-term and long-term postelongative periods the dynamics of activity level changes reflected the process of structural-and-functional reorganization of neuromuscular substrates, which, however, was not accompanied by pathologic disorders.