[Oxygen-dependent mechanisms and oxidative stress in children for femoral head osteochondropathy.]

: Degenerative-dystrophic processes in the articular tissues are accompanied by the changes in the values of congenital immunity, being a result of immune responses to aseptic inflammation. The purpose of this study - to investigate the oxygen-dependent mechanisms of neutrophil phagocytic activity (NBT-test, myeloperoxidase activity), the biochemical values of lipid peroxidation, the oxidative modification of proteins and the activity of enzyme antioxidant protection in children (at the age of 12-16 years) with osteochondropathy of the femoral head.The increase in spontaneous NBT-test and myeloperoxidase content in neutrophils, the decrease in NBT stimulation index, as well as the statistically significant increase in the activity of superoxide dismutase, the main producer of hydroperoxide, was revealed in the group examined. At the same time, no increase in catalase activity and in the content of lipoperoxidation products was observed, however, redistribution of the products of oxidative modification of proteins with ketone predominance was found. In case of osteochondropathy development in children the activation of the oxygendependent mechanisms of neutrophil phagocytic activity is observed, as well as the increase in the number of the secondary products of protein peroxidation - ketones. An increase in SOD activity, with a simultaneous and significant decrease in catalase activity evidence of accumulation of hydroperoxide causing neutrophil activation and chemotaxis. The study data can be used for predicting osteonecrosis development as additional criteria when decision-making of the advisability of performing reconstructive surgeries of the joint.