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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="other" 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">102</article-id><article-id pub-id-type="doi">10.21823/2311-2905-102</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>Unknown</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Clinical cases of patients with arthroplasty and heightened blood concentration of metal ions</article-title><trans-title-group xml:lang="ru"><trans-title>Повышение уровня ионов металла в крови пациентов после эндопротезирования: клинические случаи</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Thomsen</surname><given-names>M.</given-names></name><name xml:lang="ru"><surname>Томсен</surname><given-names>М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>marc.thomsen@klinikum-mittelbaden.de</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Krenn</surname><given-names>V.</given-names></name><name xml:lang="ru"><surname>Кренн</surname><given-names>В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Thomas</surname><given-names>P.</given-names></name><name xml:lang="ru"><surname>Томас</surname><given-names>П.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kretzer</surname><given-names>J. P.</given-names></name><name xml:lang="ru"><surname>Крецер</surname><given-names>Ж. П.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><xref ref-type="aff" rid="aff4"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Mittelbaden Clinics Baden-Baden, Trauma and Orthopaedic Surgery Units</institution></aff><aff><institution xml:lang="ru">Отделение травматологии и ортопедии Клиники Миттельбаден</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Center for Histology, Cytology and Molecular Diagnostics</institution></aff><aff><institution xml:lang="ru">Центр гистологии, цитологии и молекулярной диагностики</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Hospital and Outpatients’ Clinic for Dermatology and Allergology, Ludwig Maximilian University</institution></aff><aff><institution xml:lang="ru">Мюнхенский университет им. Людвига-Максимилиана</institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">Laboratory of Biomechanics and Implant Research, University of Heidelberg, Department of Orthopaedics</institution></aff><aff><institution xml:lang="ru">Лаборатория биомеханики и имплантологических исследований, Гейдельбергский университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2014-12-12" publication-format="electronic"><day>12</day><month>12</month><year>2014</year></pub-date><volume>20</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>85</fpage><lpage>89</lpage><history><date date-type="received" iso-8601-date="2016-09-12"><day>12</day><month>09</month><year>2016</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2014,</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2014,</copyright-statement><copyright-year>2014</copyright-year><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/></permissions><self-uri xlink:href="https://journal.rniito.org/jour/article/view/102">https://journal.rniito.org/jour/article/view/102</self-uri><abstract xml:lang="en"><p>We report on several clinical cases of different appearance and complications of patients after THR with metal-on-metal (MoM) couplings or a revision knee system. There may be skin irritation mainly due to chromium hypersensitivity or systemic effects and even cobalt intoxication can appear. We recommend clinical control to patients with MoM and a head size of 36 mm or larger or with knee revision systems. Patients who have problems such as pain or mal positioning should have measured the metall ion levels of cobalt. A serum cobalt level of &gt;7 µg /L indicates possible periprosthetic metallosis and may cause trouble. A normal serum cobalt level is below 1 µg /L. We also need an MRI with Metal-Artifact-Reduced-Sequences or if not possible an ultrasound investigation to detect pseudotumors around the hip joint. For the clinical investigation you should look and ask for general hypersensitivity reaction (skin rash), cardiomyopathy, neurological changes including sensory changes, renal function impairment or thyroid dysfunction which may occur in cobalt intoxication. To optimize the diagnostic histological investigations using the Krenn classification are extremely helpful.</p></abstract><trans-abstract xml:lang="ru"><p>Описано несколько клинических наблюдений пациентов с различными проявлениями и осложнениями после эндопротезирования тазобедренного сустава парой трения металл-металл или ревизионной артропластики коленного сустава. У таких больных может появиться раздражение кожи, в основном вследствие гиперчувствительности к хрому, и даже интоксикация кобальтом. Авторы рекомендуют проводить клиническое наблюдение за пациентами, которым установлены эндопротезы тазобедренного сустава с парой трения металл-металл и головками диаметром 36 и более мм, а также за больными после ревизионного эндопротезирования коленного сустава. У пациентов с болевым синдромом и неправильным положением компонентов эндопротеза необходимо определить уровень металлических ионов кобальта. Уровень кобальта в сыворотке крови свыше 7 мкг/л свидетельствует о наличии перипротезного металлоза, так как в норме этот показатель составляет менее 1 мкг/л. Для выявления псевдоопухолей в области тазобедренного сустава следует применять МРТ с использованием программы MARS (metal artifact reduction sequences), направленной на устранение искажений изображений и артефактов, возникающих из-за присутствия в магнитном поле металлических имплантатов. При отсутствии такой возможности можно выполнять ультразвуковое исследование. Во время клинического исследования необходимо определить наличие у пациента общей реакции гиперчувствительности (кожная сыпь), кардиомиопатии, неврологических нарушений, включая нарушения чувствительности, ухудшения функции почек или щитовидной железы, которые могут произойти вследствие интоксикации кобальтом. Оптимизировать гистологические исследования помогает использование классификации Кренна, которая приводится в тексте статьи.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>эндопротезирование</kwd><kwd>металл-металлические пары трения</kwd><kwd>гиперчувствительность к металлам</kwd><kwd>интоксикация кобальтом</kwd><kwd>arthroplasty</kwd><kwd>metal-on-metal couplings</kwd><kwd>cobalt intoxication</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Bergschmidt P, Bader R, Mittelmeier W. Metal hypersensitivity in total knee arthroplasty: revision surgery using a ceramic femoral component - a case report. Knee. 2012;19(2):144-147.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Gao X, He RX, Yan SG, Wu LD. Dermatitis associated with chromium following total knee arthroplasty. J. 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