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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">mrj</journal-id><journal-title-group><journal-title xml:lang="ru">Современная ревматология</journal-title><trans-title-group xml:lang="en"><trans-title>Modern Rheumatology Journal</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1996-7012</issn><issn pub-type="epub">2310-158X</issn><publisher><publisher-name>IMA-PRESS, LLC</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.14412/1996-7012-2025-1-110-115</article-id><article-id custom-type="elpub" pub-id-type="custom">mrj-1711</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>КЛИНИЧЕСКИЕ НАБЛЮДЕНИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CLINICAL OBSERVATIONS</subject></subj-group></article-categories><title-group><article-title>Дифференциальная диагностика нетравматического гемартроза коленного сустава (случай из практики)</article-title><trans-title-group xml:lang="en"><trans-title>Differential diagnosis of non-traumatic knee hemarthrosis (case report)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Роскидайло</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Roskidaylo</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Анастасия Александровна Роскидайло, </p><p>115522, Москва, Каширское шоссе, 34А</p></bio><bio xml:lang="en"><p>Anastasia Aleksandrovna Roskidaylo,</p><p>34A, Kashirskoe Shosse, Moscow 115522</p></bio><email xlink:type="simple">roskidailo@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">ФГБНУ «Научно-исследовательский институт ревматологии им. В.А. Насоновой»<country>Россия</country></aff><aff xml:lang="en">V.A. Nasonova Research Institute of Rheumatology<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>17</day><month>02</month><year>2025</year></pub-date><volume>19</volume><issue>1</issue><fpage>110</fpage><lpage>115</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Роскидайло А.А., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Роскидайло А.А.</copyright-holder><copyright-holder xml:lang="en">Roskidaylo A.A.</copyright-holder><license license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://mrj.ima-press.net/mrj/article/view/1711">https://mrj.ima-press.net/mrj/article/view/1711</self-uri><abstract><p>Гемартроз (ГА) коленного сустава (КС) нетравматического происхождения нечасто встречается в практике травматологаортопеда. Для дифференциальной диагностики этой патологии требуются тщательный сбор анамнеза и клинический осмотр пациента, а пункция КС лишь подтвердит наличие крови в суставе. Диагностическая артроскопия с биопсией синовиальной оболочки помогает уточнить диагноз. Наиболее частыми причинами нетравматического ГА являются опухоли сосудистого или синовиального генеза, метастазы опухолей, а также прием больших доз антикоагулянтов в сочетании с сосудистой мальформацией. Представлено клиническое наблюдение развития симптомов нетравматического ГА на фоне приема антикоагулянтов, при этом задачей ортопеда было выявление истинной причины заболевания.</p></abstract><trans-abstract xml:lang="en"><p>Hemarthrosis (HA) of the knee of non-traumatic origin is rarely encountered in the practice of a traumatologist-orthopedic surgeon. The differential diagnosis of this pathology requires a thorough medical history tacking and clinical examination of the patient, and a knee joint aspiration can only confirm the presence of blood in the joint. A diagnostic arthroscopy with a synovial biopsy helps to clarify the diagnosis. The most common causes of non-traumatic HA are tumors of vascular or synovial origin, tumor metastases and the use of high-dose anticoagulants in combination with a vascular malformation.</p><p>A clinical observation of the development of symptoms of non-traumatic HA on the background of anticoagulant use is presented, where the task of the orthopedic surgeon was to identify the true cause of the disease.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>гемартроз</kwd><kwd>коленный сустав</kwd><kwd>пигментный виллонодулярный синовит</kwd></kwd-group><kwd-group xml:lang="en"><kwd>hemarthrosis</kwd><kwd>knee joint</kwd><kwd>pigmented villonodular synoviti</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Baker CL. Acute hemarthrosis of the knee. J Med Assoc Ga. 1992 Jun;81(6):301-5.</mixed-citation><mixed-citation xml:lang="en">Baker CL. Acute hemarthrosis of the knee. 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