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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">Traumatology and Orthopedics of Russia</journal-id><journal-title-group><journal-title xml:lang="en">Traumatology and Orthopedics of Russia</journal-title><trans-title-group xml:lang="ru"><trans-title>Травматология и ортопедия России</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2311-2905</issn><issn publication-format="electronic">2542-0933</issn><publisher><publisher-name xml:lang="en">Vreden National Medical Research Center of Traumatology and Orthopedics</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">1687</article-id><article-id pub-id-type="doi">10.17816/2311-2905-1687</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Case Reports</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Случаи из практики</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="zh"><subject>Case Reports</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">Avascular Necrosis of the Femoral Head After COVID-19: A Case Series</article-title><trans-title-group xml:lang="ru"><trans-title>Остеонекроз головки бедренной кости после COVID-19: серия клинических наблюдений</trans-title></trans-title-group><trans-title-group xml:lang="zh"><trans-title/></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4686-7892</contrib-id><contrib-id contrib-id-type="spin">5834-3500</contrib-id><name-alternatives><name xml:lang="en"><surname>Panin</surname><given-names>Mikhail A.</given-names></name><name xml:lang="ru"><surname>Панин</surname><given-names>Михаил Александрович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Sci. (Med.)</p></bio><bio xml:lang="ru"><p>канд. мед. наук, доцент кафедры травматологии и ортопедии, врач-травматолог-ортопед отделения ортопедии</p></bio><email>panin-mihail@yandex.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8837-0265</contrib-id><name-alternatives><name xml:lang="en"><surname>Petrosyan</surname><given-names>Armenak S.</given-names></name><name xml:lang="ru"><surname>Петросян</surname><given-names>Арменак Серёжаевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Sci. (Med.)</p></bio><bio xml:lang="ru"><p>канд. мед. наук, заведующий отделением</p></bio><email>armenak.p@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7906-2594</contrib-id><name-alternatives><name xml:lang="en"><surname>Hadjicharalambous</surname><given-names>Kirill Kh.</given-names></name><name xml:lang="ru"><surname>Хаджихараламбус</surname><given-names>Кирилл Харалампьевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Sci. (Med.)</p></bio><bio xml:lang="ru"><p>канд. мед. наук, заведующий отделением</p></bio><email>Kyrillos6@yahoo.com</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7829-2045</contrib-id><contrib-id contrib-id-type="spin">4543-7879</contrib-id><name-alternatives><name xml:lang="en"><surname>Boiko</surname><given-names>Andrei V.</given-names></name><name xml:lang="ru"><surname>Бойко</surname><given-names>Андрей Викторович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="ru"><p>аспирант кафедры травматологии и ортопедии</p></bio><email>boiko120393@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">City Clinical Hospital No 17</institution></aff><aff><institution xml:lang="ru">ГБУЗ «Городская клиническая больница № 17 ДЗМ»</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">RUDN University</institution></aff><aff><institution xml:lang="ru">ФГАОУ ВО «Российский университет дружбы народов»</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">City Clinical Hospital No 40</institution></aff><aff><institution xml:lang="ru">ГБУЗ «Городская клиническая больница № 40 ДЗМ»</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2022-02-04" publication-format="electronic"><day>04</day><month>02</month><year>2022</year></pub-date><pub-date date-type="pub" iso-8601-date="2022-01-15" publication-format="electronic"><day>15</day><month>01</month><year>2022</year></pub-date><volume>28</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><issue-title xml:lang="zh"/><fpage>110</fpage><lpage>117</lpage><history><date date-type="received" iso-8601-date="2021-10-19"><day>19</day><month>10</month><year>2021</year></date><date date-type="accepted" iso-8601-date="2022-01-17"><day>17</day><month>01</month><year>2022</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2022, Panin M.A., Petrosyan A.S., Hadjicharalambous K.K., Boiko A.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2022, Панин М.А., Петросян А.С., Хаджихараламбус К.Х., Бойко А.В.</copyright-statement><copyright-statement xml:lang="zh">Copyright ©; 2022,</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="en">Panin M.A., Petrosyan A.S., Hadjicharalambous K.K., Boiko A.V.</copyright-holder><copyright-holder xml:lang="ru">Панин М.А., Петросян А.С., Хаджихараламбус К.Х., Бойко А.В.</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://journal.rniito.org/jour/article/view/1687">https://journal.rniito.org/jour/article/view/1687</self-uri><abstract xml:lang="en"><p>The coronavirus disease-2019 (COVID-19) has adverse effects on various organs and systems. There are isolated reports concerning the development of osteonecrosis after COVID-19. These papers discuss the role of corticosteroids widely used in the treatment of COVID-19 in the development of osteonecrosis. This article presents clinical observations of four patients with bilateral osteonecrosis of the femoral heads after treatment with COVID-19. Prednisone doses in three patients were 4000 mg, 746 mg, and 533 mg. Corticosteroids were not used in one patient. Data showed that osteonecrosis in patients who underwent coronavirus developed in a shorter time compared with this pathology in patients without COVID-19. Two of four patients had a burdened family history (such as myocardial infarction, hypertension, and thrombosis). Hereditary vascular factors possibly played some roles in the genesis of the osteonecrosis of the femoral head in these patients. To understand the features of osteonecrosis development after COVID-19, further accumulation of evidence is necessary. Several synergistically influencing factors are important in the development of this disease after COVID-19.</p></abstract><trans-abstract xml:lang="ru"><p>Известно, что COVID-19 оказывает неблагоприятное влияние на различные органы и системы организма человека. В доступной литературе имеются единичные сообщения, касающиеся развития остеонекроза после перенесенного COVID-19. В этих работах обсуждается роль широко используемых в лечении COVID-19 кортикостероидов в развитии остеонекроза. В нашей статье приводятся клинические наблюдения четырех пациентов с двусторонним остеонекрозом головок бедренных костей после лечения COVID-19. Дозы преднизолона у трех пациентов составили 4000 мг, 746 мг и 533 мг. У одной пациентки кортикостероиды не применялись. Наши данные показали, что остеонекроз у пациентов, перенесших COVID-19, развился в более короткие сроки по сравнению с этой патологией у пациентов без коронавирусной инфекции. У двух из четырех пациентов отмечен отягощенный семейный анамнез (инфаркт миокарда, гипертензия, тромбоз). Возможно, у них в генезе остеонекроза головки бедренной кости некоторую роль сыграли наследственные сосудистые факторы. Для понимания особенностей развития остеонекроза после COVID-19 необходимо дальнейшее накопление фактических данных. Вероятно, на развитие заболевания синергично воздействуют многие факторы, в том числе стероидный и ишемический.</p></trans-abstract><trans-abstract xml:lang="zh"><p/></trans-abstract><kwd-group xml:lang="en"><kwd>COVID-19</kwd><kwd>coronavirus infection</kwd><kwd>corticosteroids</kwd><kwd>aseptic necrosis</kwd><kwd>osteonecrosis</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>COVID-19</kwd><kwd>коронавирусная инфекция</kwd><kwd>кортикостероиды</kwd><kwd>асептический некроз</kwd><kwd>остеонекроз</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Han Q., Lin Q., Jin S., You L. Coronavirus 2019-nCoV: A brief perspective from the front line. J Infect. 2020;80(4):373-377. doi: 10.1016/j.jinf.2020.02.010.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Zhu N., Zhang D., Wang W., Li X., Yang B., Song J. et al. A Novel Coronavirus from Patients with Pneumonia in China, 2019. 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