Traumatology and Orthopedics of RussiaTraumatology and Orthopedics of Russia2311-29052542-0933Vreden National Medical Research Center of Traumatology and Orthopedics83910.21823/2311-2905-2017-23-4-118-124MASSIVE POSTTRAUMATIC HETEROTOPIC OSSIFICATION OF KNEE JOINT (CASE REPORT)RyazantsevM. S.<p class="MsoNormal"><span lang="EN-US">Mikhail S. Ryazantsev — Orthopaedics Surgeon ECSTO; Postgraduate Student, Department of Traumatology, Orthopaedics and Arthrology PFUR.</span></p><p class="MsoNormal"><span lang="EN-US">7, Orlovskii per., Moscow, 129110; 6, ul. Miklukho-Maklaya, Moscow, 117198</span></p>mryazantsev@emcmos.ruMagnitskayaN.<p class="MsoNormal"><span lang="EN-US">Nina E. Magnitskaya — Orthopaedics Surgeon ECSTO; Postgraduate Student, Department of Traumatology, Orthopaedics PFUR.</span></p><p class="MsoNormal"><span lang="EN-US">7, Orlovskii per., Moscow, 129110; 6, ul. Miklukho-Maklaya, Moscow, 117198</span></p>fake@neicon.ruAfanasyevA. P.<p class="MsoNormal"><span lang="EN-US">Aleksei P. Afanasyev — Cand. Sci. (Med.) Orthopedic Surgeon ECSTO.</span></p><p class="MsoNormal"><span lang="EN-US">7, Orlovskii per., Moscow, 129110</span></p>fake@neicon.ruIlʼinD. O.<p class="MsoNormal"><span lang="EN-US">Dmitrii O. Ilʼin — Cand. Sci. (Med.), Orthopaedics Surgeon ECSTO.</span></p><p class="MsoNormal"><span lang="EN-US">7, Orlovskii per., Moscow, 129110</span></p>fake@neicon.ruLogvinovA. N.<p class="MsoNormal"><span lang="EN-US">Aleksei N. Logvinov — Orthopaedics Surgeon ECSTO; Postgraduate Student, Department of Traumatology, Orthopaedics PFUR.</span></p><p class="MsoNormal"><span lang="EN-US">7, Orlovskii per., Moscow, 129110; 6, ul. Miklukho-Maklaya, Moscow, 117198</span></p>fake@neicon.ruFrolovA. V.<p class="MsoNormal"><span lang="EN-US">Aleksandr V. Frolov — Cand. Sci. (Med.), Orthopaedics Surgeon ECSTO, assistant professor of Department of Traumatology and Orthopaedics PFUR.</span></p><p class="MsoNormal"><span lang="EN-US">7, Orlovskii per., Moscow, 129110; 6, ul. Miklukho-Maklaya, Moscow, 117198</span></p>fake@neicon.ruKorolevА. V.<p class="MsoNormal"><span lang="EN-US">Andrey V. Korolev — Dr. Sci. (Med.), Chief Doctor and Medical Director ECSTO; Professor of Department of Traumatology and Orthopaedics PFUR.</span></p><p class="MsoNormal"><span lang="EN-US">7, Orlovskii per., Moscow, 129110; 6, ul. Miklukho-Maklaya, Moscow, 117198</span></p>fake@neicon.ruECSTO, European Clinic of Sports Traumatology and OrthopaedicsPeoples Friendship University of Russia251220172341181242712201727122017Copyright © ,<span style="font-size: 11.0pt; line-height: 115%; font-family: 'Calibri','sans-serif'; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: Calibri; mso-fareast-theme-font: minor-latin; mso-hansi-theme-font: minor-latin; mso-bidi-font-family: 'Times New Roman'; mso-bidi-theme-font: minor-bidi; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;" lang="EN-US">Heterotopic ossification is characterized by bone tissue formation in soft tissues that possess no osteogenic properties. The authors present a clinical case of a female patient with massive heterotopic ossification in anteromedial aspect of the right knee joint with 10 years history before admission for treatment. An abrupt knee hyperextension became a trigger mechanism for the present lesion. MR tomography demonstrated af ormation pushing off the healthy tissues along the anteromedial surface of the right joint. Computer tomography visualized a massive calcination of soft tissues. During the arthroscopic procedure the authors observed a formation of a dense consistency with round borders which demonstrated minor cohesion with surrounding tissues. The formation was</span><span style="font-size: 11.0pt; line-height: 115%; font-family: 'Calibri','sans-serif'; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: Calibri; mso-fareast-theme-font: minor-latin; mso-hansi-theme-font: minor-latin; mso-bidi-font-family: 'Times New Roman'; mso-bidi-theme-font: minor-bidi; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;" lang="EN-US">removed. Diagnosis was confirmed by histological findings. Control x-rays in 6 months after the procedure verified absence of new areas of heterotopic ossification. Removal of ossificational lowed to obtain a good clinical outcome.</span>knee heterotopic ossificationposttraumatic myositis ossificansposttraumatic complicationsгетеротопическая оссификация коленного суставаоссификация гематомыпосттравматические осложнения[1. Dejerine A., Ceillier A. Para-osteo-arthropathies des paraplegiques par lesion medullaire; etude clinique et radiographique. Ann Med. 1918;5:497.][2. Zeckey C., Hildebrand F., Frink M., Krettek C. Heterotopic ossifications following implant surgery — epidemiology, therapeutical approaches and current concepts. Semin Immunopathol. 2011;33(3):273-286. doi: 10.1007/s00281-011-0240-5.][3. Hsu J.E., Keenan M.A. Current review of heterotopic ossification. Univer Pennsylvania Orthop J. 2010;20:126-130.][4. Кесян Г.А. Уразгильдеев Р.З., Дан И.М., Арсеньев И.Г. Гетеротопическая оссификация крупных суставов при травмах и заболеваниях центральной нервной системы (обзор литературы). Кремлевская медицина. Клинический вестник. 2015;(4):78-83. 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Mavrogenis A.F., Soucacos P.N., Papagelopoulos P.J. Heterotopic ossification revisited. Orthopedics. 2011; 34(3):177. DOI: 10.3928/01477447-20110124-08.][8. Bauer A.S., Lawson B.K., Bliss R.L., Dyer G.S. Risk factors for posttraumatic heterotopic ossification of the elbow: case-control study. J Hand Surg Am. 2012;37(7):1422-1429. e6. DOI: 0363-5023/12/37A07-0019$36.00/0.][9. Iorio R., Healy W.L. Heterotopic ossification after hip and knee arthroplasty: risk factors, prevention, and treatment. J Am Acad Orthop Surg. 2002;10(6):409-416.][10. Bhandary B., Shetty S., Bangera V.V., Kassim M.S., Alva K., Bhandary S. To study the incidence of heterotopic ossification after anterior cruciate ligament reconstruction. J Clin Diagn Res. 2013;7(5):888-891. DOI: 10.7860/JCDR/2013/5348.2970.][11. Mills W.J., Tejwani N. Heterotopic ossification after knee dislocation: the predictive value of the injury severity score. J Orthop Trauma. 2003;17(5):338-345.][12. Patton W.C., Tew W.M. 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