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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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prosthesis selection in the absence of published evidence ( 30 , 31 , 32 ), and identification of specific outlier prostheses, as opposed to listing comparative rates of revision, highlights prostheses that are not performing as well as others within their

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Richard N. de Steiger Australian Orthopaedic Association National Joint Replacement Registry, SAHMRI, Adelaide, Australia
School of Public Health, Faculty of Health and Medical Sciences, University of Adelaide, Australia

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Stephen E. Graves School of Public Health, Faculty of Health and Medical Sciences, University of Adelaide, Australia

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identification of outlier prostheses . Acta Orthop 2013 ; 84 : 348 – 352 . 8. de Steiger RN Hang JR Miller LN Graves SE Davidson DC . Five-year results of the ASR XL acetabular system and the ASR hip

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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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. Surgeons use this information to improve the outcomes of THA; examples include the reduction in use after identification of outlier prostheses such as the ASR, 54 , 55 a reduction in the overall use of resurfacing hip replacement and its use largely in

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Martyn Porter The National Joint Registry of England, Wales, Northern Ireland and the Isle of Man, UK
Centre for Hip Surgery, Wrightington Hospital, UK

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Richard Armstrong The National Joint Registry of England, Wales, Northern Ireland and the Isle of Man, UK
Head of Health Registries, Northgate Public Services, Peoplebuilding 2, Hemel Hempstead, Hertfordshire, England

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Peter Howard The National Joint Registry of England, Wales, Northern Ireland and the Isle of Man, UK
Royal Derby Hospital, Derby, UK

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Matthew Porteous The National Joint Registry of England, Wales, Northern Ireland and the Isle of Man, UK
West Suffolk NHS Foundation Trust, UK

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J. Mark Wilkinson The National Joint Registry of England, Wales, Northern Ireland and the Isle of Man, UK
University of Sheffield, Sheffield, UK

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identification of 4 Level 1 outliers and 12 Level 2 outliers. Some 2,806 different combinations of hip stem/cup implants have been monitored with 17 Level 1 outliers and 40 Level 2 outliers. Most of the larger suppliers have access to a monthly download about

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Hanna Wellauer Department of Orthopaedic Surgery and Traumatology, HFR Fribourg Hospital, University of Fribourg, Fribourg, Switzerland
Division of Orthopaedics and Trauma Surgery, Cantonal Hospital Winterthur, Winterthur, Switzerland

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Roman Heuberger RMS Foundation, Bettlach, Switzerland

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Emanuel Gautier Department of Orthopaedic Surgery and Traumatology, HFR Fribourg Hospital, University of Fribourg, Fribourg, Switzerland

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Moritz Tannast Department of Orthopaedic Surgery and Traumatology, HFR Fribourg Hospital, University of Fribourg, Fribourg, Switzerland

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Hubert Steinke Institute for the History of Medicine, University of Bern, Bern, Switzerland

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Peter Wahl Division of Orthopaedics and Trauma Surgery, Cantonal Hospital Winterthur, Winterthur, Switzerland
Faculty of Medicine, University of Berne, Berne, Switzerland

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still in use nowadays ( Fig. 2 ) ( 15 ). Figure 2 Evolution of the Müller stem. In (A), the first model called ‘Setzholz’ (engl.: dibble) implanted in 1962; in (B) and (C), the ‘Setzholz’ prostheses from 1964 and 1965; in (D), the curved Müller

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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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, 20 , 21 ). Given that revision TJA requires more accurate preoperative planning and precise intraoperative identification of anatomical landmarks and resection of bone, robotic-assisted technology that combines accurate patient-specific preoperative

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George Grammatopoulos The Ottawa Hospital, Ottawa, Ontario, Canada

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Moritz Innmann Heidelberg University Hospital, Heidelberg, Germany

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Philippe Phan The Ottawa Hospital, Ottawa, Ontario, Canada

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Russell Bodner Midwest Orthopedic Institute, Sycamore, United States of America

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Geert Meermans Bravis Hospital, Roosendaal, The Netherlands

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; and lower inclination when standing; lower inclination and AI when seated Ike et al . ( 67 ) * RCS 41 200 Low-PI hips was the most predictive of the risk of impingement, and post-operatively these hips had the most outliers from

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