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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">Pediatric Hematology/Oncology and Immunopathology</journal-id><journal-title-group><journal-title xml:lang="en">Pediatric Hematology/Oncology and Immunopathology</journal-title><trans-title-group xml:lang="ru"><trans-title>Вопросы гематологии/онкологии и иммунопатологии в педиатрии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1726-1708</issn><issn publication-format="electronic">2414-9314</issn><publisher><publisher-name xml:lang="en">Fund Doctors, Innovations, Science for Children</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">1150</article-id><article-id pub-id-type="doi">10.24287/j.1150</article-id><article-id pub-id-type="edn">NGAHRS</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>ORIGINAL ARTICLES</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ОРИГИНАЛЬНЫЕ СТАТЬИ</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">Endoprosthetic reconstruction of the proximal femur in pediatric and adolescent patients with malignant tumors</article-title><trans-title-group xml:lang="ru"><trans-title>Эндопротезирование проксимального отдела бедренной кости у пациентов детского и подросткового возраста со злокачественными новообразованиями</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2210-6431</contrib-id><name-alternatives><name xml:lang="en"><surname>Artemov</surname><given-names>Artem Yu.</given-names></name><name xml:lang="ru"><surname>Артёмов</surname><given-names>Артем Юрьевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>a trauma and orthopedic surgeon at the Department of Oncology and Pediatric Surgery </p></bio><bio xml:lang="ru"><p>врач-травматолог-ортопед отделения онкологии и детской хирургии</p></bio><email>mr.a.artemov@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0002-3533-7108</contrib-id><name-alternatives><name xml:lang="en"><surname>Bykova</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Быкова</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>mr.a.artemov@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8026-0977</contrib-id><name-alternatives><name xml:lang="en"><surname>Vorochai</surname><given-names>A. M.</given-names></name><name xml:lang="ru"><surname>Ворочай</surname><given-names>А. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>mr.a.artemov@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0009-3847-2568</contrib-id><name-alternatives><name xml:lang="en"><surname>Efremenko</surname><given-names>I. I.</given-names></name><name xml:lang="ru"><surname>Ефременко</surname><given-names>И. И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>mr.a.artemov@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6848-8714</contrib-id><name-alternatives><name xml:lang="en"><surname>Konopleva</surname><given-names>E. I.</given-names></name><name xml:lang="ru"><surname>Коноплева</surname><given-names>Е. И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>mr.a.artemov@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6649-853X</contrib-id><name-alternatives><name xml:lang="en"><surname>Obraztsov</surname><given-names>I. V.</given-names></name><name xml:lang="ru"><surname>Образцов</surname><given-names>И. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>mr.a.artemov@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6313-6712</contrib-id><name-alternatives><name xml:lang="en"><surname>Bolshakov</surname><given-names>N. A.</given-names></name><name xml:lang="ru"><surname>Большаков</surname><given-names>Н. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>mr.a.artemov@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">The Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and Immunology of Ministry of Health of the Russian Federation</institution></aff><aff><institution xml:lang="ru">ФГБУ «Национальный медицинский исследовательский центр детской гематологии, онкологии и иммунологии им. Дмитрия Рогачева» Минздрава России</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2026-08-19" publication-format="electronic"><day>19</day><month>08</month><year>2026</year></pub-date><volume>25</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>72</fpage><lpage>81</lpage><history><date date-type="received" iso-8601-date="2026-06-19"><day>19</day><month>06</month><year>2026</year></date><date date-type="accepted" iso-8601-date="2026-06-30"><day>30</day><month>06</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2026, «D. Rogachev NMRCPHOI»</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2026, ФГБУ «НМИЦ ДГОИ им. Дмитрия Рогачева» Минздрава России</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="en">«D. Rogachev NMRCPHOI»</copyright-holder><copyright-holder xml:lang="ru">ФГБУ «НМИЦ ДГОИ им. Дмитрия Рогачева» Минздрава России</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://hemoncim.com/jour/article/view/1150">https://hemoncim.com/jour/article/view/1150</self-uri><abstract xml:lang="en"><p><bold>Introduction.</bold> Limb-sparing surgeries with endoprosthetic hip joint reconstruction following proximal femoral resection in children and adolescents with malignant tumors pose a significant challenge both in terms of surgical treatment and rehabilitation. The limited number of publications focused on these patients, as well as the scarcity of available data on functional outcomes and complications, emphasizes the relevance of this study.</p> <p><bold>Materials and methods.</bold> We retrospectively analyzed surgical outcomes in 61 patients aged 5 to 18 years who had undergone proximal femoral and hip joint endoprosthetic reconstruction at the Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and Immunology between January 2015 and February 2024. The median age was 13.79 years. The most common diagnoses were Ewing sarcoma (52,5%) and osteosarcoma (40,9%). Either proximal (68.9%) or total (31.1%) femoral endoprosthetic reconstructions with modular and expandable implants were performed. We analyzed functional outcomes using the MSTS score, assessed complication rates in accordance with the Henderson-ISOLS classification (2014), and evaluated implant “survival”.</p> <p><bold>Results.</bold> The median MSTS score was 66% (53%; 77%), indicating good functional outcomes. Local recurrence was observed in 4.9% of the patients. Complications developed in 21.3% of the patients, with revision surgery required in 19.7% of cases. The 5-year overall “survival” of the endoprosthesis was estimated at 72%. The 2-year implant “survival” rate was higher with cementless fixation than with cemented fixation (92.5% vs. 78.9%;<italic> p</italic> = 0.04). Endoprosthesis “survival” was also found to be sex- and age-dependent.</p> <p><bold>Conclusion.</bold> Endoprosthetic replacement following segmental resection of the proximal femur is an effective reconstructive approach in children and adolescents with malignant bone tumors, ensuring high functional restoration while resulting in acceptable complication rates. Modern modular and expandable endoprostheses allow for successful limb-sparing treatment even after extensive resections. These findings support the need for further data collection in order to optimize reconstructive strategies and prevent postoperative complications.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Введение.</bold> Проведение органосохраняющих операций с эндопротезированием тазобедренного сустава после резекции проксимального отдела бедренной кости у детей и подростков со злокачественными опухолями представляет значительную хирургическую и реабилитационную проблему. Ограниченное количество публикаций, посвященных данной когорте пациентов, а также недостаток данных о функциональных результатах и осложнениях определяют актуальность настоящего исследования.</p> <p><bold>Материалы и методы.</bold> Проведен ретроспективный анализ результатов хирургического лечения 61 пациента в возрасте от 5 до 18 лет, которым в период с января 2015 г. по февраль 2024 г. выполнено эндопротезирование проксимального отдела бедренной кости и тазобедренного сустава в НМИЦ ДГОИ им. Дмитрия Рогачева. Медиана возраста составила 13,79 года. Наиболее частыми нозологиями являлись саркома Юинга (52,5%) и остеосаркома (40,9%). Выполнялось эндопротезирование проксимального отдела (68,9%) или тотальное эндопротезирование (31,1%) бедренной кости с использованием модульных и удлиняющихся эндопротезов. Оценивали функциональные результаты по шкале MSTS, частоту осложнений по классификации Henderson (ISOLS, 2014) и «выживаемость» эндопротезов.</p> <p><bold>Результаты.</bold> Медиана оценки по шкале MSTS составила 66% (53%; 77%), что соответствует хорошему функциональному результату. Локальный рецидив выявлен у 4,9% пациентов. Осложнения зарегистрированы у 21,3% больных, ревизионные вмешательства потребовались в 19,7% случаев. Общая 5-летняя «выживаемость» эндопротеза составила 72%. Двухлетняя «выживаемость» эндопротеза была выше при бесцементной фиксации по сравнению с цементной (92,5% против 78,9%; <italic>p</italic> = 0,04). Также выявлена зависимость «выживаемости» эндопротеза от пола пациента и возраста.</p> <p><bold>Заключение.</bold> Эндопротезирование после сегментарных резекций проксимального отдела бедренной кости является эффективным методом реконструкции у детей и подростков со злокачественными опухолями костей, обеспечивая высокий уровень функционального восстановления при приемлемой частоте осложнений. Использование современных модульных и удлиняющихся эндопротезов позволяет успешно выполнять органосохраняющее лечение даже при обширных резекциях. Полученные результаты подтверждают необходимость дальнейшего накопления данных для оптимизации выбора метода реконструкции и профилактики послеоперационных осложнений.</p></trans-abstract><kwd-group xml:lang="en"><kwd>osteosarcoma</kwd><kwd>Ewing sarcoma</kwd><kwd>endoprosthetic reconstruction</kwd><kwd>proximal femur</kwd><kwd>hip joint</kwd><kwd>children</kwd><kwd>adolescents</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>остеосаркома</kwd><kwd>саркома Юинга</kwd><kwd>эндопротезирование</kwd><kwd>проксимальный отдел бедренной кости</kwd><kwd>тазобедренный сустав</kwd><kwd>дети</kwd><kwd>подростки</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Wang J., Zhanghuang C., Tan X., Mi T., Liu J., Jin L., Li M., Zhang Z., He D. A Nomogram for predicting cancer-specific survival of osteosarcoma and ewing's sarcoma in children: A SEER database analysis. Front Public Health 2022;10:837506. 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