MedApp S.A. 1 article published in JoVE Medicine The Use of Mixed Reality in Custom-Made Revision Hip Arthroplasty: A First Case Report Paweł Łęgosz1, Krzysztof Starszak1,2, Maciej Stanuch3,4, Maciej Otworowski1, Łukasz Pulik1, Adriana Złahoda-Huzior3,4, Andrzej Skalski3,4 1Department of Orthopaedics and Traumatology of the Musculoskeletal System, Infant Jesus Teaching Hospital, Medical University of Warsaw, 2Department of Human Anatomy, Medical University of Silesia, 3Department of Measurement and Electronics, AGH University of Science and Technology, 4MedApp S.A. A complex revision hip arthroplasty was performed using a custom-made implant and mixed reality technology. According to the authors' knowledge, this is the first report of such procedure described in the literature.