Measurement of tensor polarization of deuterons from He-3 -\u3e d plus p breakup at internal momenta up to 0.4 GeV/c

The tensor polarization (rho 20) of deuterons emitted in the p(He-3, d)X reaction at 0 degrees in the lab. system was measured at the Saturne National Laboratory in Sac lay, using the SPES-4 spectrometer with the HYPOM polarimeter in the area of its focal plane. The momentum of the detected deuterons was kept fixed at 3.77 GeV/c, while the momentum of the He-3 beam was varied from 4.60 to 5.66 GeV/c, thus providing a range of internal momenta k of the deuteron inside the He-3 from 0 up to 0.4 GeV/c. The obtained data are compared with the theoretical predictions

Recurrence time in chronic posttraumatic osteomyelitis of the tibia

Chronic posttraumatic osteomyelitis is a difficult-to-cure disease of the musculoskeletal system. The relationship between the course of the disease and the presence of type 2 diabetes mellitus has been revealed. It is necessary to predict the time of remission after initial diagnosis in this concomitant pathology. The paper includes data on the rehabilitation outcome of 57 patients with Ciery-Mader 3A (group 1) and 3B (group 2) osteomyelitis. Type 2 diabetes mellitus was a factor of systemic deficiency in wound healing in group 2. Clinical, radiological, and descriptive statistics methods were used. In patients with chronic osteomyelitis and concomitant type 2 diabetes mellitus, the risk of recurrence of purulent inflammatory process in the first year of follow-up increased by 20%. In the absence of systemic compromising factors, purulent process recurrence became more likely in the longterm follow-up periods up to 5 yearsХронический посттравматический остеомиелит является трудноизлечимым заболеваний опорно-двигательной системы. Выявлена взаимосвязь между течением заболевания и наличием сахарного диабета 2 типа. Необходимо прогнозирование сроков ремиссии после первичной постановки диагноза при данной сопутствующей патологии. В работу включены данные по исходу реабилитации 57 пациентов с остеомиелитом 3А (1 группа) и 3B (2 группа) по Ciery-Mader. Фактором системного дефицита заживления ран во второй группе являлся сахарный диабет 2 типа. Применены клинический, рентгенологический и методы описательной статистики. При наличии у пациентов хронического остеомиелита и сопутствующего сахарного диабета 2 типа риски рецидива гнойно-воспалительного процесса в первый год наблюдения возрастали на 20%. В отсутствии системных компрометирующих факторов рецидив гнойного процесса становился более вероятным в отдаленные периоды наблюдения до 5 ле

Morphological Changes in the Tibial Nerve During the Treatment of Large Tibia Defects Using Ilizarov Apparatus Combining with the Masquelet Technique: Experimental Study

Background. The use of Masquelet technology in combination with non-free osteoplasty according to Ilizarov in order to compensate large defects of the lower leg bones provides proper bone union and recurrence-free course of the disease, but the problem of patient rehabilitation remains relevant. The course and duration of the recovery period depend on the morphofunctional state of the tibial nerves. The purpose of this study was to determine morphological changes in the tibia nerve of dogs during the experimental treatment of large tibial defects using Ilizarov apparatus combining with the Masquelet technique. Materials and Methods. A defect of the upper third of the tibia in the form of false joint was created in 10 mongrel dogs. Then this defect was replaced with 25 mm diastasis, into which a cement spacer was placed. After 30 days, the latter was removed. At the level of the lower third, transverse osteotomy was performed, as well as distraction of 1 mm rate for 4 times per day, until complete contact of the fragments in the defect zone. The tibial nerves were studied within the periods of 60 days of fixation (F60) and 30 days after the fixator removal (FR30). Results. There were no mechanical damages of the nerves. During the experiment a part of epineural veins and arteries had obliterated lumens, two-fold decrease in the numerical density of endoneural arterioles, venules and capillaries was observed in FR30 — 97.5±2.5 in 1 mm2 (normally — 182.0±22.0), that evidenced of microcirculatory disorders progressing towards the end of the experiment. Patterns of Wallerian degeneration were found along with typical damages to fibers during distraction osteosynthesis demyelination and axonal degeneration. In F60 the proportion of modified fibers was 7.7±1.5%, which was 4.8 times higher (р = 0.52×10-5) above normal, the numerical densities and dimensional characteristics of fibers decreased. At the end of the experiment, the proportion of modified conductors 2.3-fold exceeded the norm (p = 0.33×10-4) — 3.7±0.4%, the numerical density of fibers remained 10.2% below the norm (p = 0.0362), making up 17436±865, but the average axon diameter and thickness of myelin sheaths were restored. Conclusion. Microcirculatory dysfunction, axonal atrophy, demyelination, Wallerian degeneration of a part of myelin nerve fibers and a decrease in their number revealed in the tibial nerves during the treatment of large tibia defects using the Masquelet technique combining with Ilizarov non-free bone grafting indicated the need for the use of adequate neurometabolic pharmacotherapy and effective rehabilitation