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Andreas Fontalis Royal National Orthopaedic Hospital NHS Trust, Brockley Hill, Stanmore, UK
Academic Unit of Bone Metabolism, University of Sheffield Medical School, Sheffield, UK

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

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Katharine Bennett-Brown Chelsea and Westminster Hospital NHS Foundation Trust, Chelsea, London, UK

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

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et al, 2018 23 59/65 PD Primary THA: hydroxyapatite-coated, double-tapered titanium stem ( N = 38), Modular global stem ( N = 4). Revision THA: (optimum stem, N = 4). Cementless acetabular implant Primary and revision: dual

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Bülent Atilla Hacettepe University Faculty of Medicine, Ankara, Turkey

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fragment. In extreme conditions of distorted anatomy, special implant designs such as cone prostheses and modular uncemented stems simplify the management of excessive anatomical deformity or canal tightness. Some authors prefer step-cut osteotomy to

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Eustathios Kenanidis Academic Orthopaedic Department, Papageorgiou General Hospital, Aristotle University Medical School, Hellas, Greece
Center of Orthopaedics and Regenerative Medicine (C.O.RE.) – Center of Interdisciplinary Research and Innovation (C.I.R.I.) – Aristotle University Thessaloniki, Balkan Center, Hellas, Greece
Hôpital de la Tour, Geneva, Switzerland

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Konstantinos Kapriniotis Center of Orthopaedics and Regenerative Medicine (C.O.RE.) – Center of Interdisciplinary Research and Innovation (C.I.R.I.) – Aristotle University Thessaloniki, Balkan Center, Hellas, Greece

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Panagiotis Anagnostis Center of Orthopaedics and Regenerative Medicine (C.O.RE.) – Center of Interdisciplinary Research and Innovation (C.I.R.I.) – Aristotle University Thessaloniki, Balkan Center, Hellas, Greece

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Michael Potoupnis Academic Orthopaedic Department, Papageorgiou General Hospital, Aristotle University Medical School, Hellas, Greece
Center of Orthopaedics and Regenerative Medicine (C.O.RE.) – Center of Interdisciplinary Research and Innovation (C.I.R.I.) – Aristotle University Thessaloniki, Balkan Center, Hellas, Greece

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Panayiotis Christofilopoulos Hôpital de la Tour, Geneva, Switzerland

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Eleftherios Tsiridis Academic Orthopaedic Department, Papageorgiou General Hospital, Aristotle University Medical School, Hellas, Greece
Center of Orthopaedics and Regenerative Medicine (C.O.RE.) – Center of Interdisciplinary Research and Innovation (C.I.R.I.) – Aristotle University Thessaloniki, Balkan Center, Hellas, Greece

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of SCD patients for the included studies Author Surgical Approach Type of anaesthesia Type of fixation Type of stem Femoral Head/bearing couple Type of Cup Functional Score (preop/postop) Bishop et al 9

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Joris Duerinckx Ziekenhuis Oost-Limburg, Genk, Belgium

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Frederik Verstreken Monica Hospital, Antwerp, Belgium

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as Moberg-Gedda or Wagner) incision. The choice between both depends on the preference of the surgeon as neither is superior. Both approaches have been described in detail by Tchurukdichian and Lussiez ( 34 ). Stem placement in the thumb

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Feng Xie The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China

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Shuya Sheng Leeds Institute of Rheumatic and Musculoskeletal Medicine (LIRMM), University of Leeds, Leeds, UK

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Jeya Palan Leeds Institute of Rheumatic and Musculoskeletal Medicine (LIRMM), University of Leeds, Leeds, UK

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Hemant G Pandit Leeds Institute of Rheumatic and Musculoskeletal Medicine (LIRMM), University of Leeds, Leeds, UK

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dissatisfaction, and litigation ( 4 ). Hip resurfacing arthroplasty (HRA) is an attractive alternative to standard stemmed THA. HRA are metal-on-metal (MoM) articulations, and various in vitro assessments have confirmed a low wear rate with the use of MoM

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Georgios Tsikandylakis Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sweden
Region Västra Götaland, Sahlgrenska University Hospital, Department of Orthopaedics, Gothenburg, Sweden

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

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

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Johan Kärrholm Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sweden
Region Västra Götaland, Sahlgrenska University Hospital, Department of Orthopaedics, Gothenburg, Sweden
The Swedish Hip Arthroplasty Register, Gothenburg, Sweden

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magnitude as reported for MoXLPE bearings. Mihalko et al reviewed 32 studies on MoM and 19 on CoC articulations with at least five years follow-up. 53 Both groups included five registry studies each. In addition, 20 studies of modular stem designs were

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Thomas Kozak Albany Health Campus, Albany, Australia
Royal Perth Hospital, Perth, Australia

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Stefan Bauer Ensemble Hospitalier de la Côte, Morges, Switzerland

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Gilles Walch Hôpital Privé Jean-Mermoz, Centre Orthopédique Santy, Lyon, France

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Saad Al-karawi Albany Health Campus, Albany, Australia

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William Blakeney Albany Health Campus, Albany, Australia
Royal Perth Hospital, Perth, Australia

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lateralization produces. Modifications to the humeral stem include onlay systems, curved short stems and changes to the neck-shaft angle. The most widely used neck-shaft angle for RTSA has been 155° (see Fig. 1 ) for more than 10 years. 4 , 54 , 62 – 66

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Daniel Bachman University of Missouri-Kansas City, Kansas City, USA

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Akin Cil University of Missouri-Kansas City, Kansas City, USA

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manufactured by Wright Medical Technology (Arlington, TN, USA), and formerly by Tornier (St Ismier, France). The general design concept is a modular spool and stem combination to re-create the articular surface and mechanical support of the distal humerus. The

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Georgios Tsikandylakis Department of Orthopaedics, Sahlgrenska University Hospital, Gothenburg, Sweden
Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sweden
Swedish Hip Arthroplasty Register, Gothenburg, Sweden

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Maziar Mohaddes Department of Orthopaedics, Sahlgrenska University Hospital, Gothenburg, Sweden
Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sweden
Swedish Hip Arthroplasty Register, Gothenburg, Sweden

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Peter Cnudde Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sweden
Swedish Hip Arthroplasty Register, Gothenburg, Sweden
Department of Orthopaedics, Prince Philip Hospital, HDUHB, Wales

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

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Johan Kärrholm Department of Orthopaedics, Sahlgrenska University Hospital, Gothenburg, Sweden
Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sweden
Swedish Hip Arthroplasty Register, Gothenburg, Sweden

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

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. Head size and taper corrosion Fretting and corrosion, also known as ‘trunnionosis’, at the head-neck junction of modular metal heads has gained a lot of attention in recent years. Although more common in MoM, 41 , 43 it has also been reported in

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Pascal-André Vendittoli Personalized Arthroplasty Society
Surgery Department, Hôpital Maisonneuve-Rosemont, Montreal University, Montreal, Québec, Canada
Clinique orthopédique Duval, 1487 Boul des Laurentides, Laval

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Charles Riviere Personalized Arthroplasty Society
Bordeaux Arthroplasty Research Institute - Clinique du Sport Bordeaux-Mérignac 04-06 rue Georges Negrevergne, Mérignac, France

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Michael T Hirschmann Personalized Arthroplasty Society
Department of Orthopedic Surgery and Traumatology, Kantonsspital Baselland, Bruderholz, Switzerland
Clinical Research Group Michael T. Hirschmann, Regenerative Medicine & Biomechanics, University of Basel, Basel, Switzerland

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Stefano Bini Personalized Arthroplasty Society
Department of Surgery, University of California, San Francisco, California, USA

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(neck angle, offset, stem anchoring in the diaphyseal area, etc.). It is likely that in THA, like in TKA, the precise restoration of the patient’s anatomy may improve the prosthetic joint’s stability, kinematics, function, perception, and longevity

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