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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">N.N. Priorov Journal of Traumatology and Orthopedics</journal-id><journal-title-group><journal-title xml:lang="en">N.N. Priorov Journal of Traumatology and Orthopedics</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник травматологии и ортопедии им. Н.Н. Приорова</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0869-8678</issn><issn publication-format="electronic">2658-6738</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">655983</article-id><article-id pub-id-type="doi">10.17816/vto655983</article-id><article-id pub-id-type="edn">IIYFKQ</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Original study articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Оригинальные исследования</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Microbiological monitoring of major pathogens in infected long bone fractures treated with external osteosynthesis</article-title><trans-title-group xml:lang="ru"><trans-title>Результаты микробиологического мониторинга ведущих возбудителей при инфицированных переломах длинных костей в условиях чрескостного остеосинтеза</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1721-282X</contrib-id><contrib-id contrib-id-type="spin">2312-1002</contrib-id><name-alternatives><name xml:lang="en"><surname>Tsiskarashvili</surname><given-names>Archil V.</given-names></name><name xml:lang="ru"><surname>Цискарашвили</surname><given-names>Арчил Важаевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Cand. Sci. (Medicine)</p></bio><bio xml:lang="ru"><p>канд. мед. наук</p></bio><email>armed05@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5283-7078</contrib-id><contrib-id contrib-id-type="spin">8288-0256</contrib-id><name-alternatives><name xml:lang="en"><surname>Melikova</surname><given-names>Regina E.</given-names></name><name xml:lang="ru"><surname>Меликова</surname><given-names>Регина Энверпашаевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Cand. Sci. (Medicine)</p></bio><bio xml:lang="ru"><p>канд. мед. наук</p></bio><email>regina-melikova@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1314-2887</contrib-id><contrib-id contrib-id-type="spin">1402-5186</contrib-id><name-alternatives><name xml:lang="en"><surname>Nazarenko</surname><given-names>Anton G.</given-names></name><name xml:lang="ru"><surname>Назаренко</surname><given-names>Антон Герасимович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Corresponding Member of the Russian Academy of Sciences, MD, Dr. Sci. (Medicine), Professor of RAS</p></bio><bio xml:lang="ru"><p>член-корреспондент РАН, д-р мед. наук, профессор РАН</p></bio><email>nazarenkoag@cito-priorov.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Priorov Central Research Institute of Traumatology and Orthopedics</institution></aff><aff><institution xml:lang="ru">Национальный медицинский исследовательский центр травматологии и ортопедии им. Н.Н. Приорова</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2025-05-26" publication-format="electronic"><day>26</day><month>05</month><year>2025</year></pub-date><pub-date date-type="pub" iso-8601-date="2025-07-22" publication-format="electronic"><day>22</day><month>07</month><year>2025</year></pub-date><volume>32</volume><issue>2</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>457</fpage><lpage>475</lpage><history><date date-type="received" iso-8601-date="2025-02-14"><day>14</day><month>02</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-03-10"><day>10</day><month>03</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Eco-Vector</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Эко-Вектор</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Eco-Vector</copyright-holder><copyright-holder xml:lang="ru">Эко-Вектор</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2026-07-22"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc-nd/4.0/</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.eco-vector.com/0869-8678/article/view/655983">https://journals.eco-vector.com/0869-8678/article/view/655983</self-uri><abstract xml:lang="en"><p><bold>BACKGROUND:</bold><bold> </bold>The development of fracture-related infection disrupts osteoreparative processes at the fracture site, which may result in the need for repeated surgical interventions. It is well known that the etiology of fracture-related infection involves microorganisms, whose spectrum may vary considerably across healthcare facilities. <italic>Staphylococcus aureus</italic> and coagulase-negative staphylococci are the predominant pathogens in this condition, whereas Gram-negative bacteria, anaerobes, and fungi are less common.</p> <p><bold>AIM:</bold><italic> </italic>The work is aimed to determine the spectrum and changes of major pathogens in patients with long bone fracture-related infection and post-traumatic chronic osteomyelitis treated with external osteosynthesis from 2019 to 2024.</p> <p><bold>METHODS:</bold><italic> </italic>A single-center retrospective analysis was conducted based on microbiological findings in 247 patients with long bone fracture-related infection and chronic osteomyelitis as its sequela, all treated with external osteosynthesis. The spectrum of major pathogens and their changes over time were examined. The statistical analysis was performed using Pearson’s chi-square(χ<sup>2</sup>) test.</p> <p><bold>RESULTS:</bold><italic> </italic>Positive cultures were obtained in 70.4% of cases, whereas 29.6% were negative. A total of 230 microorganisms were identified: 158 (68.7%) Gram-positive, 71 (30.9%) Gram-negative, and 1 (0.4%) fungal isolate. Monomicrobial infections were revealed in 76.4% of cases, whereas in 23.6% of cases, the infection was polymicrobial. A microbial shift was observed in 18.4% of patients: in 15.5% during treatment and in 2.9% upon recurrence.</p> <p><bold>DISCUSSION:</bold><italic> </italic>The major causative pathogens of fracture-related infection were <italic>S</italic><italic>. aureus</italic> (36.9%), <italic>S. epidermidis</italic> (10%), <italic>K. pneumoniae</italic> (9.1%), <italic>E. faecalis</italic> (7.8%), <italic>A. baumannii</italic> (6.1%), <italic>P. aeruginosa</italic> (4.3%), <italic>E. cloacae</italic> and <italic>Corynebacterium</italic> (3.5% each). Between 2019 and 2024, the incidence of <italic>MRSE</italic> and <italic>E. faecalis</italic> increased from 0.6% to 5.7% and 8.2%, respectively; <italic>Corynebacterium</italic> from 0% to 3.2%; <italic>K. pneumoniae</italic> from 2.8% to 12.7%; and <italic>E. cloacae</italic> from 1.4% to 9.9%. A microbial shift during treatment was observed in patients with open fractures and extensive soft tissue defects. Microbial composition showed unpredictable variation. In cases of recurrence, the primary isolate was often replaced by <italic>MSSA</italic>, <italic>E. faecalis</italic>, or <italic>Corynebacterium</italic>.</p> <p><bold>CONCLUSION:</bold> Despite an increasing proportion of <italic>MRSE</italic>, <italic>E. faecalis</italic>, <italic>Corynebacterium</italic>, <italic>K. pneumoniae</italic>, and <italic>E. cloacae</italic> in the etiological structure of fracture-related infection, <italic>S. aureus</italic> remains the predominant pathogen.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Обоснование.</bold> Развитие<bold> </bold>перелом-ассоциированной инфекции (ПАИ) нарушает остеорепаративные процессы в области перелома, в результате чего могут потребоваться неоднократные оперативные вмешательства. Общеизвестно, что в основе этиологии ПАИ лежат микробы, спектр которых в разных клиниках может сильно варьировать. Ведущими возбудителями при данной патологии, как правило, являются золотистый и коагулазонегативные стафилококки, в меньшей степени встречаются грамотрицательные микробы, анаэробы и грибы.</p> <p><bold>Цель.</bold> Определить спектр ведущих возбудителей и их динамику у пациентов с ПАИ длинных костей и хроническим остеомиелитом как её последствием, пролеченных методом чрескостного остеосинтеза в период 2019–2024 гг.</p> <p><bold>Материалы</bold><bold> </bold><bold>и</bold><bold> </bold><bold>методы.</bold> Проведён одноцентровой ретроспективный анализ результатов микробиологического исследования 247 пациентов с ПАИ длинных костей и хроническим остеомиелитом как её последствием, пролеченных методом чрескостного остеосинтеза. Изучен спектр ведущих возбудителей и определена их динамика по временным периодам. Статистическая обработка данных выполнена с помощью критерия χ<sup>2</sup> Пирсона.</p> <p><bold>Результаты.</bold> Положительный рост получен у 70,4% пациентов, отрицательный — у 29,6%. Всего идентифицировано 230 микроорганизмов: грамположительных было 158 (68,7%), грамотрицательных — 71 (30,9%), грибов — 1 (0,4%). Мономикробная инфекция выявлена в 76,4% случаев, полимикробная — в 23,6%. У 18,4% отмечена смена микробов: у 15,5% она выявлена в процессе лечения и у 2,9% — при рецидиве. Ведущими возбудителями ПАИ являются <italic>S</italic><italic>.</italic><italic> </italic><italic>aureus</italic> (36,9%), <italic>S</italic><italic>.</italic><italic> </italic><italic>epidermidis</italic><italic> </italic>(10%), <italic>K</italic><italic>.</italic><italic> </italic><italic>pneumoniae</italic> (9,1%), <italic>E</italic><italic>.</italic><italic> </italic><italic>faecalis</italic> (7,8%), <italic>A</italic><italic>.</italic><italic> </italic><italic>baumannii</italic> (6,1%), <italic>P</italic><italic>.</italic><italic> </italic><italic>aeruginosa</italic> (4,3%), <italic>E</italic><italic>.</italic><italic> </italic><italic>cloacae</italic> и <italic>Corynebacterium</italic> (по 3,5% соответственно). В период с 2019 по 2024 г. увеличилась доля <italic>MRSE</italic> и <italic>E</italic><italic>.</italic><italic> </italic><italic>faecalis</italic> c 0,6 до 5,7 и 8,2% соответственно, <italic>Corynebacterium</italic> с 0 до 3,2%, <italic>K</italic><italic>.</italic><italic> </italic><italic>pneumoniae</italic> с 2,8 до 12,7%, <italic>E</italic><italic>.</italic><italic> </italic><italic>cloacae</italic> с 1,4 до 9,9%. Смена микроорганизмов отмечена в процессе лечения у пациентов с открытыми переломами костей и обширными мягкотканными дефектами. При этом вариативность микрофлоры была непредсказуемой. При рецидиве первичная культура менялась в основном на <italic>MSSA</italic>, <italic>E</italic><italic>.</italic><italic> </italic><italic>faecalis</italic> или <italic>Corynebacterium</italic>.</p> <p><bold>Заключение.</bold> Несмотря на увеличение доли <italic>MRSE</italic>, <italic>E</italic><italic>.</italic><italic> </italic><italic>faecalis</italic>, <italic>Corynebacterium</italic>, <italic>K</italic><italic>.</italic><italic> </italic><italic>pneumoniae</italic> и <italic>E</italic><italic>.</italic><italic> </italic><italic>cloacae</italic> в структуре ПАИ, ведущим возбудителем остаётся <italic>S</italic><italic>.</italic><italic> </italic><italic>aureus</italic>.</p></trans-abstract><kwd-group xml:lang="en"><kwd>major pathogens</kwd><kwd>infected fracture</kwd><kwd>post-traumatic chronic osteomyelitis</kwd><kwd>long bones</kwd><kwd>fracture-related infection</kwd><kwd>microbiological monitoring</kwd><kwd>external osteosynthesis</kwd><kwd>microbial shift.</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>ведущие возбудители</kwd><kwd>инфицированный перелом</kwd><kwd>посттравматический хронический остеомиелит</kwd><kwd>длинные кости</kwd><kwd>перелом-ассоциированная инфекция</kwd><kwd>ПАИ</kwd><kwd>микробиологический мониторинг</kwd><kwd>чрескостный остеосинтез</kwd><kwd>смена микроорганизмов</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Giannitsioti E, Salles MJ, Mavrogenis A, et al.; The Esgiai Collaborators Study Group. 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