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Anne Lübbeke Division of Orthopaedic Surgery & Traumatology, Geneva University Hospitals and University of Geneva, Switzerland
Botnar Research Centre, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, UK

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Christophe Combescure Division of Clinical Epidemiology, Geneva University Hospitals and University of Geneva, Switzerland

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Christophe Barea Division of Orthopaedic Surgery & Traumatology, Geneva University Hospitals and University of Geneva, Switzerland

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Amanda Inez Gonzalez Division of Orthopaedic Surgery & Traumatology, Geneva University Hospitals and University of Geneva, Switzerland

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Keith Tucker Chair Orthopaedic Data Evaluation Panel, UK

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Per Kjærsgaard-Andersen Center for Adult Hip and Knee Reconstruction, Department of Orthopaedics, South Danish University, Vejle Hospital, Denmark

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Tom Melvin School of Medicine, Trinity College Dublin, Ireland

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Alan G Fraser Department of Cardiology, University Hospital of Wales, Cardiff, UK

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Rob Nelissen Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands

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James A Smith Centre for Statistics in Medicine, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, UK
National Institute for Health Research Oxford Biomedical Research Centre, John Radcliffe Hospital, Oxford, UK

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obtained lists of hip cups ( n = 138), hip stems ( n = 165), and knee ( n = 97) implants. From that pool of CE-marked implants, ten devices were then randomly selected from each of the three lists. The unit of analysis used was determined for the hip

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Keijo T. Mäkelä Turku University Hospital and University of Turku, Finland, and the Finnish Arthroplasty Register

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Ove Furnes Haukeland University Hospital, Bergen, Norway, and the Norwegian Arthroplasty Register

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Geir Hallan Haukeland University Hospital, Bergen, Norway, and the Norwegian Arthroplasty Register

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Anne Marie Fenstad Haukeland University Hospital, Bergen, Norway, and the Norwegian Arthroplasty Register

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Ola Rolfson Sahlgrenska University Hospital and University of Gothenburg, Sweden, and the Swedish Hip Arthroplasty Register

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Johan Kärrholm Sahlgrenska University Hospital and University of Gothenburg, Sweden, and the Swedish Hip Arthroplasty Register

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Cecilia Rogmark Department of Orthopedics, Skåne University Hospital, Department of Clinical Sciences Malmö, Lund University, and the Swedish Hip Arthroplasty Register, Sweden

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Alma Becic Pedersen Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark, and the Danish Hip Arthroplasty Register

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Otto Robertsson The Swedish Knee Arthroplasty Register, Department of Orthopedics, Skåne University Hospital, and Department of Clinical Sciences, Orthopedics, Lund University, Sweden

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Annette W-Dahl The Swedish Knee Arthroplasty Register, Department of Orthopedics, Skåne University Hospital, and Department of Clinical Sciences, Orthopedics, Lund University, Sweden

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Antti Eskelinen Coxa Hospital for Joint Replacement, Tampere, Finland, and the Finnish Arthroplasty Register

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Henrik M. Schrøder Department of Orthopaedic Surgery, Naestved Hospital, Denmark, and the Danish Knee Arthroplasty Register

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Ville Äärimaa Turku University Hospital and University of Turku, Finland, and the Finnish Arthroplasty Register

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Jeppe V. Rasmussen Department of Orthopaedic Surgery, Herlev Hospital, University of Copenhagen, Denmark, and the Danish Shoulder Arthroplasty Register

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Björn Salomonsson Department of Orthopedics, Karolinska Institutet, Danderyds Sjukhus AB, Sweden, and the Swedish Shoulder Arthroplasty Register

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Randi Hole Haukeland University Hospital, Bergen, Norway, and the Norwegian Arthroplasty Register

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Søren Overgaard Department of Orthopaedic Surgery and Traumatology, Odense University Hospital, Department of Clinical Research, University of Southern Denmark, and the Danish Hip Arthroplasty Register

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those classified according to fixation technique as cemented, uncemented, and hybrids (uncemented cup/cemented stem). Focus on metal-on-metal hip devices Johanson et al (2010) compared 1638 hip resurfacing arthroplasties in Sweden, Norway and

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Claus Varnum The Danish Hip Arthroplasty Register
Department of Orthopaedic Surgery, Vejle Hospital, Vejle, Denmark

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Alma Bečić Pedersen Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark

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Ola Rolfson The Swedish Hip Arthroplasty Register
Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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Cecilia Rogmark The Swedish Hip Arthroplasty Register
Lund University, Skåne University Hospital, Department of Orthopedics, Malmö, Sweden

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Ove Furnes The Norwegian Arthroplasty Register, Department of Orthopedic Surgery, Haukeland University Hospital, Bergen, Norway
Department of Clinical Medicine, University of Bergen, Bergen, Norway

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Geir Hallan The Norwegian Arthroplasty Register, Department of Orthopedic Surgery, Haukeland University Hospital, Bergen, Norway
Department of Clinical Medicine, University of Bergen, Bergen, Norway

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Keijo Mäkelä The Finnish Arthroplasty Register
Department of Orthopaedics and Traumatology, Turku University Hospital, Turku, Finland

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Richard de Steiger Australian Orthopaedic Association National Joint Replacement Registry (AOANJRR), Adelaide, Australia
Department of Surgery, Epworth HealthCare, University of Melbourne, Melbourne, Australia

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Martyn Porter The National Joint Registry of England, Wales, Northern Ireland and Isle of Man
Centre for Hip Surgery, Wrightington Hospital, Wrightington, Wigan and Leigh NHS Trust, Lancashire, United Kingdom

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Søren Overgaard The Danish Hip Arthroplasty Register
Orthopaedic Research Unit, Department of Clinical Research, University of Southern Denmark, Odense, Denmark
Department of Orthopaedic Surgery and Traumatology, Odense University Hospital, Odense, Denmark

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components used in THA in Sweden. Likewise, for acetabular components, ten different cup designs account for > 82% of the production. 12 Thein et al investigated design-related features of the three most commonly used stems in Sweden. Although the most

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Xiang-Dong Wu Department of Orthopaedic Surgery, Beijing Jishuitan Hospital, Fourth Clinical College of Peking University, Beijing, China

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Yixin Zhou Department of Orthopaedic Surgery, Beijing Jishuitan Hospital, Fourth Clinical College of Peking University, Beijing, China

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Hongyi Shao Department of Orthopaedic Surgery, Beijing Jishuitan Hospital, Fourth Clinical College of Peking University, Beijing, China

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Dejin Yang Department of Orthopaedic Surgery, Beijing Jishuitan Hospital, Fourth Clinical College of Peking University, Beijing, China

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Sheng-Jie Guo Department of Orthopaedic Surgery, Beijing Jishuitan Hospital, Fourth Clinical College of Peking University, Beijing, China

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Wei Huang Department of Orthopaedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China

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) 2021 China Case series 71 patients (68 cup revisions + 68 stem revisions) THA converted to RTHA MAKO — Three types of registration techniques (extra acetabular bone surface based, liner based, metal shell-based or cage surface-based) on

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Christoph H. Lohmann Department of Orthopeadic Surgery, Otto-von-Guericke University, Leipziger Str. 44,39120 Magdeburg, Germany

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Sanjiv Rampal Department of Orthopeadic Surgery, Otto-von-Guericke University, Leipziger Str. 44,39120 Magdeburg, Germany

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Martin Lohrengel Department of Orthopeadic Surgery, Otto-von-Guericke University, Leipziger Str. 44,39120 Magdeburg, Germany

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Gurpal Singh Division of Musculoskeletal Oncology, University Orthopaedics Hand and Reconstructive Microsurgery Cluster, National University Health System, 1E Kent Ridge Road, 119228 Singapore

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own experience, we feel that this is especially true in certain situations – bone loss due to osteolysis around the acetabular cup of a total hip arthoplasty (THA) and the femoral component of the total knee arthroplasty (TKA). The underlying reason is

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M M Morlock Institute of Biomechanics, TUHH Hamburg University of Technology, Hamburg, Germany

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E Gomez-Barrena Department of Orthopaedic Surgery and Traumatology, Universidad Autónoma de Madrid, Madrid, Spain

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D C Wirtz Department of Orthopaedics and Traumatology, University Hospital Bonn, Bonn, Germany

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A Hart London Implant Retrieval Centre, Royal National Orthopaedic Hospital, Stanmore, UK

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J P Kretzer Department of Orthopaedic Surgery, Heidelberg University Hospital, Heidelberg, Germany

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by the orthopaedic community, frequently resulting in discontinuation. Figure 1 Massive osteolysis around the acetabular cup and the femoral stem of an uncemented total hip arthroplasty due to PE wear 7 years after implantation

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Richard N de Steiger Australian Orthopaedic Association National Joint Replacement Registry, SAHMRI, Adelaide, Australia

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Brian R Hallstrom Michigan Arthroplasty Registry Collaborative Quality Initiative University of Michigan, Department of Orthopaedic Surgery, Ann Arbor, Michigan, USA

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Anne Lübbeke Geneva Arthroplasty Registry, Geneva University Hospitals Rue Gabrielle-Perret-Gentil 4 CH-1211 Geneva, Switzerland

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Elizabeth W Paxton Surgical Outcomes and Analysis Unit, Kaiser Permanente National Implant Registries 8954 Rio San Diego Drive, Suite, San Diego, California, USA

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Liza N van Steenbergen Dutch Arthroplasty Register (Landelijke Registratie Orthopedische Implantaten (LROI)), Bruistensingel 230 | 5232 AD ’s-Hertogenbosch, The Netherlands

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Mark Wilkinson Department of Oncology and Metabolism, University of Sheffield, Beech Hill Road, Sheffield, United Kingdom
National Joint Replacement for England, Wales, Northern Ireland, Isle of Man and the States of Guernsey (NJR)

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Registry combined both hip and knee data and introduced a similar method of evaluating acetabular cups and femoral stems as SKAR had previously done. The Swiss National Hip and Knee Joint Registry uses similar methodology to the AOANJRR with the

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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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• Resurfacing Set 1 - Set 2 - - Hip acetabulum • Monoblock (complete cup) • Mobile backing • Cemented • Press-fit • Screw cup Set 1 Set 1 Set 2 Set 3 - Hip liner - • Standard Set 1 Set 1 - Set 3

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Søren Overgaard Department of Orthopaedic Surgery and Traumatology, Copenhagen University Hospital, Copenhagen, Denmark
Department of Clinical Medicine, Faculty of Health & Medical Sciences, University of Copenhagen, Copenhagen, Denmark

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Thomas M Grupp Aesculap AG Research & Development & Medical Scientific Affairs, Tuttlingen, Germany
Department of Orthopaedic and Trauma Surgery, Ludwig Maximilians University Munich, Musculoskeletal University Center Munich (MUM), Campus Grosshadern, Munich, Germany

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Rob GHH Nelissen Department of Orthopaedics, Leiden University Medical Center, Leiden, the Netherlands
Technical University Delft, Delft, the Netherlands

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Luca Cristofolini Department of Industrial Engineering, School of Engineering and Architecture, Alma Mater Studiorum - Università di Bologna, Bologna, Italy

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Anne Lübbeke Division of Surgery and Traumatology, Geneva University Hospitals and University of Geneva, Switzerland
Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, UK

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Marcus Jäger Department of Orthopaedics, Trauma & Reconstructive Surgery St. Marien Hospital Mülheim an der Ruhr & Chair of Orthopaedics and Trauma Surgery University of Duisburg–Essen, Essen, Germany

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Matthias Fink TÜV Süd Product Service GmbH, Clinical Centre of Excellence, Munich Germany

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Sabine Rusch Aesculap AG Research & Development & Medical Scientific Affairs, Tuttlingen, Germany

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Hassan Achakri Zimmer Biomet, Clinical, Regulatory & Quality Affairs, Winterthur, Switzerland

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Francesco Benazzo IUSS Pavia, Fondazione Poliambulanza Istituto Ospedaliero, Brescia, Italy

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Dario Bergadano Medacta International SA, Medical Affairs, Castel San Pietro, Switzerland

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Georg N Duda Julius Wolff Institute and Center for Muskuloskeletal Surgery, Berlin Institute of Health at Charité Universitätsmedizin Berlin, Germany

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Christian Kaddick EndoLab Mechanical Engineering GmbH, Riedering, Germany

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Volkmar Jansson Department of Orthopaedic and Trauma Surgery, Ludwig Maximilians University Munich, Musculoskeletal University Center Munich (MUM), Campus Grosshadern, Munich, Germany

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Klaus-Peter Günther University Clinic Carl Gustav Carus, Center for Orthopaedic & Trauma Surgery, Technical University Dresden, Dresden, Germany

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which might not have any direct influence on implant performance/fixation/patient, that is, minor optimisations on given implants. Some examples are an adjusted radius in the locking mechanism between the acetabular cup and insert; a different shape of

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Bart G. Pijls Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands

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Jennifer M. T. A. Meessen Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands

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Keith Tucker Implant Performance Committee, England and Wales National Joint Registry, ODEP, Beyond Compliance and MHRA Expert Advisory Group for MoM Prostheses, London, UK

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Susanna Stea Istituto Ortopedico Rizzoli, Bologna, Italy

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Liza Steenbergen Dutch Arthroplasty Register (Landelijke Registratie Orthopedische Implantaten, LROI), 's- Hertogenbosch, The Netherlands

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Anne Marie Fenstad The Norwegian Arthroplasty Register, Department of Orthopaedic Surgery, Haukeland University Hospital, Bergen, Norway

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Keijo Mäkelä Department of Orthopedics and Traumatology, Turku University Hospital, Turku, Finland

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Ioan Cristian Stoica Foisor Orthopaedics Clinical Hospital, Bucharest, Romania

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Maxim Goncharov VJRR, Russian Scientific Research Institute of Traumatology and Orthopedics, St Petersburg, Russia

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Søren Overgaard Department of Orthopedic Surgery and Traumatology, Odense University Hospital, Odense, Denmark

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Jorge Arias de la Torre Departament de Salut, Agència de Qualitat i Avaluació Sanitàries de Catalunya (AQuAS), Barcelona, Spain
CIBER Epidemiología y Salud Pública (CIBERESP), Madrid, Spain
Instituto de Biomedicina (IBIOMED). Universidad de León, León, Spain

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Anne Lübbeke Division of Orthopaedic Surgery and Traumatology, Geneva University Hospitals, Geneva, Switzerland
Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK

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Ola Rolfson Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden

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Rob G. H. H. Nelissen Department of Orthopaedics, Leiden University Medical Center, Leiden, The Netherlands

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cups in stemmed large head MoM implants. Primary revisions Five-year revision rates The resurfacings and stemmed large head MoM implants had higher pooled revision rates at five years than the standard THA ( Fig. 1 ): 6.0%, 95% confidence

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