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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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James R Satalich VCU Health Department of Orthopaedic Surgery, Richmond, Virginia, USA

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Daniel J Lombardo VCU Health Department of Orthopaedic Surgery, Richmond, Virginia, USA

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Simon Newman Nuffield Orthopaedic Center, University of Oxford, Oxford, UK

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Gregory J Golladay VCU Health Department of Orthopaedic Surgery, Richmond, Virginia, USA

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Nirav K Patel VCU Health Department of Orthopaedic Surgery, Richmond, Virginia, USA

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the 4 mm drill bit used for acetabular cup screws ( Fig. 4 ). These holes should be particularly placed superiorly in the anterior–superior and posterior–superior zones, from 10 to 2 o’clock on a clock face. The bone surface should be cleaned with

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Khaled M. Sarraf St Mary’s Hospital, Imperial College Healthcare Trust, London, UK

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Ravi Popat St Mary’s Hospital, Imperial College Healthcare Trust, London, UK

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Kathryn L. Kneale St Mary’s Hospital, Imperial College Healthcare Trust, London, UK

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Rajarshi Bhattacharya St Mary’s Hospital, Imperial College Healthcare Trust, London, UK

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Manoj Ramachandran The Royal London Hospital, Barts Health NHS Trust, London, UK

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Pramod Achan The Royal London Hospital, Barts Health NHS Trust, London, UK

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Sammy A. Hanna The Royal London Hospital, Barts Health NHS Trust, London, UK

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(revision rate of 20% performed at an average of 3.7 years) secondary to aseptic loosening of the cup ( n = 4), femoral neck fractures ( n = 2) and unexplained pain ( n = 1) at a mean time of six years. Of the 24 failed THAs (revision rate of 10.6% with

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Vasileios F Pegios Academic Orthopaedic Department, Aristotle University Medical School, General Hospital Papageorgiou, Thessaloniki, Greece
Centre of Orthopaedic and Regenerative Medicine (CORE), Center for Interdisciplinary Research and Innovation (CIRI)-Aristotle University of Thessaloniki (AUTH), Balkan Center, Thessaloniki, Greece

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Eustathios Kenanidis Academic Orthopaedic Department, Aristotle University Medical School, General Hospital Papageorgiou, Thessaloniki, Greece
Centre of Orthopaedic and Regenerative Medicine (CORE), Center for Interdisciplinary Research and Innovation (CIRI)-Aristotle University of Thessaloniki (AUTH), Balkan Center, Thessaloniki, Greece

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Stavros Tsotsolis Centre of Orthopaedic and Regenerative Medicine (CORE), Center for Interdisciplinary Research and Innovation (CIRI)-Aristotle University of Thessaloniki (AUTH), Balkan Center, Thessaloniki, Greece
Department of Trauma and Orthopaedics, Guy’s and St Thomas’ NHS Foundation Trust, London, UK

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Michael Potoupnis Academic Orthopaedic Department, Aristotle University Medical School, General Hospital Papageorgiou, Thessaloniki, Greece
Centre of Orthopaedic and Regenerative Medicine (CORE), Center for Interdisciplinary Research and Innovation (CIRI)-Aristotle University of Thessaloniki (AUTH), Balkan Center, Thessaloniki, Greece

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Eleftherios Tsiridis Academic Orthopaedic Department, Aristotle University Medical School, General Hospital Papageorgiou, Thessaloniki, Greece
Centre of Orthopaedic and Regenerative Medicine (CORE), Center for Interdisciplinary Research and Innovation (CIRI)-Aristotle University of Thessaloniki (AUTH), Balkan Center, Thessaloniki, Greece

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. Table 2 Surgical and implant characteristics. Reference Surgical Approach Type of fixation, n Type of stem Type of cup Type of femoral head/ bearing couple U C H RH N/A Aro et al. ( 30 ) N/A 49

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Peter Luca DiGiovanni Kinesiology Laboratory, Geneva University Hospitals and University of Geneva, Geneva, Switzerland
Division of Orthopaedic Surgery and Musculoskeletal Trauma Care, Surgery Department, Geneva University Hospitals and University of Geneva, Geneva, Switzerland

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Xavier Gasparutto Kinesiology Laboratory, Geneva University Hospitals and University of Geneva, Geneva, Switzerland
Division of Orthopaedic Surgery and Musculoskeletal Trauma Care, Surgery Department, Geneva University Hospitals and University of Geneva, Geneva, Switzerland

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Stéphane Armand Kinesiology Laboratory, Geneva University Hospitals and University of Geneva, Geneva, Switzerland
Division of Orthopaedic Surgery and Musculoskeletal Trauma Care, Surgery Department, Geneva University Hospitals and University of Geneva, Geneva, Switzerland

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Didier Hannouche Division of Orthopaedic Surgery and Musculoskeletal Trauma Care, Surgery Department, Geneva University Hospitals and University of Geneva, Geneva, Switzerland

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length difference, and those of the cup and stem such as inclination/anteversion ( 10 , 11 , 12 ). One of these particularly crucial parameters that has received a great deal of research attention is offset. All three definitions of offsets are

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Keith Tucker Orthopaedic Data Evaluation Panel (ODEP), Norwich, UK

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Klaus-Peter Günther University Centre of Orthopedics, Trauma and Plastic Surgery, University Hospital Carl Gustav Carus Dresden, Technische Universität Dresden, Germany

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Per Kjaersgaard-Andersen Department of Orthopaedics, Vejle Hospital, South Danish University, Vejle, Denmark

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Jörg Lützner University Centre of Orthopedics, Trauma and Plastic Surgery, University Hospital Carl Gustav Carus Dresden, Technische Universität Dresden, Germany

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Jan Philippe Kretzer Laboratory of Biomechanics and Implant Research, Clinic for Orthopedics and Trauma Surgery, Heidelberg University Hospital, Heidelberg, Germany

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

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Toni Lange Center for Evidence-based Healthcare, University Hospital Carl Gustav Carus and Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, Germany

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Luigi Zagra IRCCS Istituto Ortopedico Galeazzi, Hip Department, Milan, Italy

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has been hypothesized that in THA the combination of different implants from different manufacturers can lead to adverse effects. 37 – 40 A typical example of mix & match would be combining an acetabular cup and liner from one company with a stem and

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Patrick Butler Department of Orthopaedic Surgery and Traumatology, Odense University Hospital, Odense, Denmark

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Josef Gorgis Department of Orthopaedic Surgery and Traumatology, Odense University Hospital, Odense, Denmark

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Bjarke Viberg Department of Orthopaedic Surgery and Traumatology, Kolding Hospital – part of Hospital Lillebaelt, Kolding, Denmark
Department of Regional Health Research, University of Southern Denmark, Odense, Denmark

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Søren Overgaard Department of Orthopaedic Surgery and Traumatology, Odense University Hospital, Odense, Denmark
Department of Clinical Research, University of Southern Denmark, Odense, Denmark

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process and was associated with a nearly twofold increased risk of revision. 13 A Swedish register study did not find significant increased risk of early revision during the implementation phase of new cup designs. The authors claimed that less than 5

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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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Stig Storgaard Jakobsen Department of Orthopaedic Surgery, Aarhus University Hospital, Denmark

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Søren Overgaard Orthopaedic Research Unit, Department of Orthopaedic Surgery and Traumatology, Odense University Hospital, Denmark

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Kjeld Søballe Department of Orthopaedic Surgery, Aarhus University Hospital, Denmark

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Ole Ovesen Orthopaedic Research Unit, Department of Orthopaedic Surgery and Traumatology, Odense University Hospital, Denmark

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Bjarne Mygind-Klavsen Department of Orthopaedic Surgery, Aarhus University Hospital, Denmark

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Christian Andreas Dippmann Section for Sports Traumatology M51, Department of Orthopaedic Surgery, Bispebjerg Hospital, Denmark

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Michael Ulrich Jensen Department of Orthopaedics, Aalborg University Hospital, Denmark

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Jens Stürup Department of Orthopaedics, National University Hospital, Denmark

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Jens Retpen Department of Orthopaedic Surgery, Copenhagen University Hospital, Gentofte, Denmark

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flexion and internal rotation. The pain is also typical in the C-sign region and will often result in referred pain to the anterior part of the femur. The C-sign is when the patient cups their hands in a C-shape right above the greater trochanter to

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