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Mattia Loppini Department of Biomedical Sciences, Humanitas University, Via Rita Levi Montalcini 4, Pieve Emanuele, Milan, Italy
IRCCS Humanitas Research Hospital, Via Manzoni 56, Rozzano, Milan, Italy
Fondazione Livio Sciutto Onlus, Campus Savona - Università degli Studi di Genova, Via Magliotto 2, Savona, Italy

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Francesco Manlio Gambaro Department of Biomedical Sciences, Humanitas University, Via Rita Levi Montalcini 4, Pieve Emanuele, Milan, Italy
IRCCS Humanitas Research Hospital, Via Manzoni 56, Rozzano, Milan, Italy

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Marco di Maio Università degli Studi di Trieste, Piazzale Europa 1, Trieste, Italy

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Guido Grappiolo IRCCS Humanitas Research Hospital, Via Manzoni 56, Rozzano, Milan, Italy
Fondazione Livio Sciutto Onlus, Campus Savona - Università degli Studi di Genova, Via Magliotto 2, Savona, Italy

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possible to restore the bone stock ( 3 , 4 ). During the past decades, the development of classification systems to describe the femoral defects has been the subject of increasing interest. The first classification was developed by Gross et al. ( 5

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Fabian Tobias Spindler Department of Orthopaedics and Trauma Surgery, Musculoskeletal University Center Munich (MUM), University Hospital, LMU Munich, Munich, Germany

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Wolfgang Böcker Department of Orthopaedics and Trauma Surgery, Musculoskeletal University Center Munich (MUM), University Hospital, LMU Munich, Munich, Germany

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Hans Polzer Department of Orthopaedics and Trauma Surgery, Musculoskeletal University Center Munich (MUM), University Hospital, LMU Munich, Munich, Germany

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Sebastian Felix Baumbach Department of Orthopaedics and Trauma Surgery, Musculoskeletal University Center Munich (MUM), University Hospital, LMU Munich, Munich, Germany

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rotational instability. Only a complete rupture of all three ligaments (AiTFL, IOL, and PiTFL) causes a multiplanar instability of the DTFJ and leads to a frank diastasis ( 9 ). The diagnosis and classification of two-ligament (AiTFL and IOL ruptures) and

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Alexandre Lädermann La Tour Hospital; University of Geneva; Geneva University Hospitals, Switzerland

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Stephen S. Burkhart The San Antonio Orthopaedic Group; University of Texas Health Science Center, San Antonio, Texas, USA

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Pierre Hoffmeyer Geneva University Hospitals, Switzerland

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Lionel Neyton Mermoz Hospital, Lyon, France

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Philippe Collin Centre Hospitalier Privé Saint-Grégoire, Saint- Grégoire, France

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Evan Yates St Francis Memorial Hospital, San Francisco, USA

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Patrick J. Denard Southern Oregon Orthopedics, Medford, Oregon, USA

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Introduction A clear consensus on the classification of rotator cuff lesions (RCLs) does not yet exist. A valuable classification system would be reproducible, encourage communication among surgeons and would provide more precise information

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Victor Housset Clinique de l'épaule, Clinique Maussins-Nollet, Paris, France

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Sean Wei Loong Ho Department of Orthopedic Surgery, Tan Tock Seng Hospital, Singapore

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Alexandre Lädermann Division of Orthopaedics and Trauma Surgery, Hôpital de La Tour, Meyrin, Switzerland
FORE (Foundation for Research and Teaching in Orthopedics, Sports Medicine, Trauma, and Imaging in the Musculoskeletal System), Meyrin, Switzerland
Division of Orthopaedics and Trauma Surgery, Department of Surgery, Geneva University Hospitals, Geneva, Switzerland

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Sean Kean Ann Phua Department of Orthopedic Surgery, Tan Tock Seng Hospital, Singapore

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Si Jian Hui Department of Orthopaedic Surgery, National University Health System, Singapore

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Geoffroy Nourissat Clinique de l'épaule, Clinique Maussins-Nollet, Paris, France

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described as shoulder instability in two or more directions ( 1 ). Since then, however, there have been differences in the literature regarding the exact definition and classification of MDI. There are several reasons for the discrepancies in definition. MDI

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Alp Paksoy Charité University Hospital, Center for Musculoskeletal Surgery, Augustenburger Platz 1, Berlin, Germany

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Doruk Akgün Charité University Hospital, Center for Musculoskeletal Surgery, Augustenburger Platz 1, Berlin, Germany

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Sebastian Lappen Schulthess Klinik, Lengghalde 2, Zurich, Switzerland

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Philipp Moroder Schulthess Klinik, Lengghalde 2, Zurich, Switzerland

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ABC classification Due to the multifactorial etiology and pathomechanism, diagnosis and treatment decisions for posterior shoulder instability (PSI) remain a challenge in clinical practice ( 1 , 2 ). This is why we introduced the ABC

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Geke A. W. Denissen Landelijke Registratie Orthopedische Implantaten (Dutch Arthroplasty Register), ’s Hertogenbosch, The Netherlands

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Liza N. van Steenbergen Landelijke Registratie Orthopedische Implantaten (Dutch Arthroplasty Register), ’s Hertogenbosch, The Netherlands

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Wouter T. Lollinga Landelijke Registratie Orthopedische Implantaten (Dutch Arthroplasty Register), ’s Hertogenbosch, The Netherlands

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Nico J. J. Verdonschot Dept. of Biomechanics, Radboud University Medical Center, Nijmegen, The Netherlands
Department of Biomechanical Engineering, University of Twente, Enschede, The Netherlands

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Berend W. Schreurs Landelijke Registratie Orthopedische Implantaten (Dutch Arthroplasty Register), ’s Hertogenbosch, The Netherlands
Dept. of Orthopaedics, Radboud University Medical Center, Nijmegen, The Netherlands

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Rob G. H. H. Nelissen Landelijke Registratie Orthopedische Implantaten (Dutch Arthroplasty Register), ’s Hertogenbosch, The Netherlands
Dept. of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands

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prosthetic component characteristics. 3 , 4 These projects show great promise to facilitate the process in the long term, but a short-term need for a generic orthopaedic implant product classification library has existed in the Netherlands since 2007

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G. Vilà-Canet ICATME, Institut Universitari Quirón-Dexeus, Barcelona, Spain

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A. García de Frutos ICATME, Institut Universitari Quirón-Dexeus, Barcelona, Spain

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A. Covaro ICATME, Institut Universitari Quirón-Dexeus, Barcelona, Spain

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M.T. Ubierna ICATME, Institut Universitari Quirón-Dexeus, Barcelona, Spain

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E. Caceres ICATME, Institut Universitari Quirón-Dexeus, Barcelona, Spain
Universitat Autónoma de Barcelona, Spain

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of therapeutic decision. In 2013 Winklhofer et al 7 analysed how the use of MRI could change the classification degree of a fracture when compared to a CT scan study alone. They found the AO classification changed in 31% of patients when MRI was

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Maximilian M. Menger Department of Trauma and Reconstructive Surgery, Eberhard Karls University Tuebingen, BG Trauma Center Tuebingen, Germany

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Benedikt J. Braun Department of Trauma and Reconstructive Surgery, Eberhard Karls University Tuebingen, BG Trauma Center Tuebingen, Germany

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Steven C. Herath Department of Trauma and Reconstructive Surgery, Eberhard Karls University Tuebingen, BG Trauma Center Tuebingen, Germany

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Markus A. Küper Department of Trauma and Reconstructive Surgery, Eberhard Karls University Tuebingen, BG Trauma Center Tuebingen, Germany

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Mika F. Rollmann Department of Trauma and Reconstructive Surgery, Eberhard Karls University Tuebingen, BG Trauma Center Tuebingen, Germany

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Tina Histing Department of Trauma and Reconstructive Surgery, Eberhard Karls University Tuebingen, BG Trauma Center Tuebingen, Germany

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results. 9 – 11 Moreover, the lack of a reliable uniform classification system with a prognostic value as well as the ongoing controversies about the optimal surgical approach and fixation treatment 8 , 12 make this injury even more challenging

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Martin McNally The Bone infection Unit, Nuffield Orthopaedic Centre, Oxford University Hospitals, Oxford, UK

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Irene Sigmund The Bone infection Unit, Nuffield Orthopaedic Centre, Oxford University Hospitals, Oxford, UK
Department of Orthopaedics and Trauma Surgery, Medical University of Vienna, Austria

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Andrew Hotchen The Bone infection Unit, Nuffield Orthopaedic Centre, Oxford University Hospitals, Oxford, UK

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Ricardo Sousa Porto Bone and Joint Infection Group (GRIP), Department of Orthopaedics, Centro Hospitalar Universitario Santo António and CUF-Hospitais e Clinicas, Portugal

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group and combine the outcomes, but we regularly do this with PJI, with and without a draining sinus. Therefore, we need to consider stratifying PJIs after they have been diagnosed. Classification systems can help describe clinical problems in a

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Sophie Abrassart Division of Orthopaedics and Trauma Surgery, La Tour Hospital, Meyrin, Switzerland

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Franck Kolo Rive Droite Radiology Centre, Geneva, Switzerland

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Sébastian Piotton Division of Orthopaedics and Trauma Surgery, La Tour Hospital, Meyrin, Switzerland

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Joe Chih-Hao Chiu Department of Orthopaedic Sports Medicine, Chang Gung Memorial Hospital, Taoyuan City, Taiwan

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Patrick Stirling ReSurg SA, Nyon, Switzerland

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Pierre Hoffmeyer Division of Orthopaedics and Trauma Surgery, Department of Surgery, Geneva University Hospitals, Geneva, Switzerland

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Alexandre Lädermann Division of Orthopaedics and Trauma Surgery, La Tour Hospital, Meyrin, Switzerland
Division of Orthopaedics and Trauma Surgery, Department of Surgery, Geneva University Hospitals, Geneva, Switzerland
Faculty of Medicine, University of Geneva, Switzerland

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) and diagnosis (presence of the above symptoms in the face of a normal radiograph). 2 , 3 , 6 Although assessment of symptoms is fairly consistent, consensus quickly breaks down when it comes to the naming, classification and natural history of the

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