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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">17500</article-id><article-id pub-id-type="doi">10.17816/2311-2905-17500</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">Lowering of the Patella — prevention and treatment of a rare complication during leg lengthening: a case report</article-title><trans-title-group xml:lang="ru"><trans-title><italic>Patella baja</italic> надколенника — профилактика и лечение редкого осложнения при удлинении нижней конечности: клинический случай</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/0000-0003-0107-3423</contrib-id><name-alternatives><name xml:lang="en"><surname>Kirienko</surname><given-names>Alexander</given-names></name><name xml:lang="ru"><surname>Кириенко</surname><given-names>Александр</given-names></name><name xml:lang="zh"><surname></surname><given-names></given-names></name></name-alternatives><address><country country="IT">Italy</country></address><bio xml:lang="en"><p>MD</p></bio><email>alexander@kirienko.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4603-659X</contrib-id><name-alternatives><name xml:lang="en"><surname>Vandenbulcke</surname><given-names>Filippo</given-names></name><name xml:lang="ru"><surname>Ванденбулке</surname><given-names>Филиппо</given-names></name><name xml:lang="zh"><surname></surname><given-names></given-names></name></name-alternatives><address><country country="IT">Italy</country></address><bio xml:lang="en"><p>MD</p></bio><email>filippo.vandenbulcke@humanitas.it</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0239-080X</contrib-id><name-alternatives><name xml:lang="en"><surname>Malagoli</surname><given-names>Emiliano</given-names></name><name xml:lang="ru"><surname>Малаголи</surname><given-names>Эмилиано</given-names></name><name xml:lang="zh"><surname></surname><given-names></given-names></name></name-alternatives><address><country country="IT">Italy</country></address><bio xml:lang="en"><p>MD</p></bio><email>emiliano.malagoli@gmail.com</email><xref ref-type="aff" rid="aff3"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Humanitas Clinical and Research Center – IRCCS</institution></aff><aff><institution xml:lang="ru">Humanitas Clinical and Research Center – IRCCS</institution></aff><aff><institution xml:lang="zh"></institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Humanitas University, Department of Biomedical Sciences</institution></aff><aff><institution xml:lang="ru">Humanitas University, Department of Biomedical Sciences</institution></aff><aff><institution xml:lang="zh"></institution></aff></aff-alternatives><aff id="aff3"><institution>Humanitas Clinical and Research Center – IRCCS</institution></aff><pub-date date-type="preprint" iso-8601-date="2024-08-30" publication-format="electronic"><day>30</day><month>08</month><year>2024</year></pub-date><pub-date date-type="pub" iso-8601-date="2024-09-30" publication-format="electronic"><day>30</day><month>09</month><year>2024</year></pub-date><volume>30</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><issue-title xml:lang="zh"/><fpage>105</fpage><lpage>111</lpage><history><date date-type="received" iso-8601-date="2024-03-16"><day>16</day><month>03</month><year>2024</year></date><date date-type="accepted" iso-8601-date="2024-06-04"><day>04</day><month>06</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Eco-Vector</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Эко-Вектор</copyright-statement><copyright-statement xml:lang="zh">Copyright ©; 2024,</copyright-statement><copyright-year>2024</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/"/><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://journal.rniito.org/jour/article/view/17500">https://journal.rniito.org/jour/article/view/17500</self-uri><abstract xml:lang="en"><p><bold>Background.</bold> Changes in the level of the patella position are a well-known complication of knee replacement, reconstruction of the anterior cruciate ligament, high tibial osteotomy and consequences of injuries. However, this problem has not been disclosed in the literature in relation to distraction osteogenesis using the Ilizarov method.</p> <p><bold>The aim of the study </bold>is to describe such a rare iatrogenic complication as patella baja during limb lengthening by the Ilizarov method using a clinical case as an example.</p> <p><bold>Case description.</bold> In 2017, a 17-year-old teenager was injured in a head-on collision of cars at high speed. The patient was diagnosed with an open fracture of the left femur and fibula and tibia of the left leg. He was treated in another clinic using the Ilizarov apparatus for osteosynthesis of the femur, tibia and proximal osteotomy of the tibia to move the bone to fill the distal bone defect. At the end of the treatment, the patient had a moderate limitation of the knee flexion (180-80°). In 2018, the patient was admitted to our clinic due to osteomyelitis at the level of the consolidated fracture. A new resection of the osteomyelitis lesion and proximal osteotomy for bifocal osteogenesis were performed. During the treatment, limitation of knee flexion (180-120°) was developed and radiographic signs of low position of the patella were obtained. Given the progression of patella baja (the Caton-Deschamps index = 0.51), we were forced to return the patient to the operating room to restore the correct height of the patella.</p> <p><bold>Conclusions. </bold>The presented clinical case emphasizes the need for a more thorough assessment of the patella height after surgical treatment on the proximal tibia using the Ilizarov method. It is also noted that it is important to conduct a control MRI, which allows for a more detailed study of the initial position of the anterior tibial tubercle. In our case, early detection of complications allowed us to achieve complete recovery without any consequences.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Актуальность. </bold>Изменение уровня положения надколенника является хорошо известным осложнением при эндопротезировании, реконструкции передней крестообразной связки, высокой остеотомии большеберцовой кости и последствиях травм. Однако до сих пор в литературе не была раскрыта данная проблема применительно к дистракционному остеогенезу по методу Илизарова.</p> <p><bold>Цель исследования </bold>— на примере клинического случая описать такое редкое ятрогенное осложнение, как patella baja при удлинении конечности по методу Илизарова.</p> <p><bold>Описание клинического случая. </bold>В 2017 г. 17-летний подросток получил травму при лобовом столкновении автомобилей на высокой скорости. У пациента был диагностирован открытый перелом левой бедренной кости и обеих костей левой голени. Он проходил лечение в другой клинике с использованием аппарата Илизарова для остеосинтеза бедренной кости, костей голени и проксимальной остеотомии большеберцовой кости для перемещения кости с целью заполнения дистального дефекта кости. В конце лечения у пациента наблюдалось умеренное ограничение амплитуды сгибания конечности в коленном суставе (180–80°).</p> <p>В 2018 г. пациент поступил в нашу клинику по поводу остеомиелита на уровне консолидированного перелома. Были выполнены новая резекция очага остеомиелита и проксимальная остеотомия для бифокального остеогенеза. Во время лечения у пациента развилось ограничение сгибания колена (180–120°) и были получены рентгенологические признаки низкого стояния надколенника. Учитывая прогрессирование patella baja (коэффициент Катона – Дешама составил 0,51), мы были вынуждены провести еще одно хирургическое вмешательство, чтобы восстановить правильную высоту надколенника.</p> <p><bold>Заключение. </bold>Представленный клинический случай подчеркивает необходимость более тщательной оценки высоты стояния надколенника после операции на проксимальном отделе большеберцовой кости по методу Илизарова. Также важно проводить контрольное МРТ-исследование, позволяющее более подробно изучить исходное положение переднего большеберцового бугорка. В нашем случае раннее выявление осложнений позволило добиться полного выздоровления без каких-либо последствий.</p></trans-abstract><trans-abstract xml:lang="zh"><p/></trans-abstract><kwd-group xml:lang="en"><kwd>patella baja</kwd><kwd>tibial tubercle</kwd><kwd>patellar tendon lengthening</kwd><kwd>Z-plasty</kwd><kwd>Ilizarov method</kwd><kwd>bone transport</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>patella baja</kwd><kwd>большеберцовый бугорок</kwd><kwd>удлинение сухожилия надколенника</kwd><kwd>Z-пластика</kwd><kwd>метод Илизарова</kwd><kwd>бифокальный остеогенез</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Lascombes P., Popkov D., Huber H., Haumont T., Journeau P. Classification of complications after progressive long bone lengthening: Proposal for a new classification. 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