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William G. Blakeney Department of Surgery, CIUSSS-de-L’Est-de-L’Ile-de-Montréal, Hôpital Maisonneuve Rosemont, Montréal, Québec, Canada
Department of Surgery, Albany Health Campus, Albany, Australia

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Jean-Alain Epinette Clinique Médico-chirurgicale, Bruay la Buissière, France

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Pascal-André Vendittoli Department of Surgery, Albany Health Campus, Albany, Australia
Department of Surgery, Université de Montréal, Montréal, Québec, Canada

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and at the neck–polyethylene contact area (third articulation) (see Fig. 2 ). Fig. 1 Typical design of a ‘modern’ dual mobility (DM) cup, with a large polyethylene (PE) liner ball articulating with a highly polished metallic acetabular shell

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Rory Cuthbert The Royal London Hospital, London, UK

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James Wong Barking, Havering and Redbridge University Hospitals, Romford, UK

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Philip Mitchell South West London Elective Orthopaedic Centre, Epsom, UK

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Parag Kumar Jaiswal Royal Free London NHS Foundation Trust, London, UK

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acetabular shell, the dual mobility cup (DMC) combines Charnley’s low-friction principle with the McKee–Farrar concept of an increased femoral head-to-neck ratio to maximize stability. 4 , 5 Despite promising results in reducing instability in France

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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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of the cup implant. Fracture of the trapezium is a possible intraoperative complication and is most often caused by malpositioning of the cup. This can be the consequence of insufficient exposure to the trapezium, which is to be avoided. When good

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Gösta Ullmark Länssjukhuset i Gävle, Sweden

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stated that “Cup anteversion should be 20° ± 5°, as measured about the axis of the cup (not the longitudinal axis of the body). To ensure proper positioning, close attention also must be paid to the orientation of the pelvis, especially when using a

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Lisa Renner Centre for Musculoskeletal Surgery, Charité Universitätsmedizin, Berlin, Germany

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Viktor Janz Centre for Musculoskeletal Surgery, Charité Universitätsmedizin, Berlin, Germany

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Carsten Perka Centre for Musculoskeletal Surgery, Charité Universitätsmedizin, Berlin, Germany

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Georgi I. Wassilew Centre for Musculoskeletal Surgery, Charité Universitätsmedizin, Berlin, Germany

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positioning of the cup and shaft (anteversion, inclination and antetorsion) and the equalisation of leg length. Deviations in these parameters arising through planning errors and intra-operative misinterpretation can lead to a higher rate of complications such

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Luca Pierannunzii Gaetano Pini Orthopedic Institute, Milan, Italy
IRCCS Galeazzi Orthopedic Institute, Milan, Italy

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Luigi Zagra Gaetano Pini Orthopedic Institute, Milan, Italy
IRCCS Galeazzi Orthopedic Institute, Milan, Italy

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-fit implantation of a hemispherical prosthetic cup, often supplemented with transacetabular screws. Conversely, major column allografts 15 are employed in massive peri-acetabular deficiencies (i.e. type III) and often require dedicated revision devices (cages

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Nanne Kort CortoClinics, Nederweert, Netherlands

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Patrick Stirling ReSurg SA, Nyon, Switzerland

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Peter Pilot IMUKA, Roosteren, The Netherlands

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Jacobus Hendrik Müller ReSurg SA, Nyon, Switzerland

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et al 11 reported on radiographic outcomes, which could not be considered because they had fewer than three clinical studies on each outcome. Han et al 2 reported on radiographic outcomes, including acetabular cup inclination, cup anteversion, stem

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Thomas J. Holme Epsom & St Helier University Hospitals NHS Trust, Trauma & Orthopaedics, Carshalton, UK

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Marta Karbowiak Royal Surrey NHS Foundation Trust, Trauma & Orthopaedics, Guildford, UK

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Jennifer Clements Epsom & St Helier University Hospitals NHS Trust, Trauma & Orthopaedics, Carshalton, UK

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Ritesh Sharma Epsom & St Helier University Hospitals NHS Trust, Trauma & Orthopaedics, Carshalton, UK

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Johnathan Craik Epsom & St Helier University Hospitals NHS Trust, Trauma & Orthopaedics, Carshalton, UK

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Najab Ellahee Epsom & St Helier University Hospitals NHS Trust, Trauma & Orthopaedics, Carshalton, UK

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.1 – – Pre 3.1 Post 4.5 – 7% 5% (cup) 6% ARPE Craik (2017) 8 qDASH : 16.8. VAS Satisfaction : 8.7 – – – – 5% 0% 10% ARPE Robles-Molina (2017) 9 qDASH : Pre 74.67 Post 21.79 VAS Pain : Pre 9.3 Post 1

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Habeeb Bishi South West London Elective Orthopaedic Centre, Epsom General Hospital, Epsom, Surrey, UK

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Joshua B V Smith South West London Elective Orthopaedic Centre, Epsom General Hospital, Epsom, Surrey, UK

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Vipin Asopa South West London Elective Orthopaedic Centre, Epsom General Hospital, Epsom, Surrey, UK

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Richard E Field South West London Elective Orthopaedic Centre, Epsom General Hospital, Epsom, Surrey, UK

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Chao Wang South West London Elective Orthopaedic Centre, Epsom General Hospital, Epsom, Surrey, UK

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David H Sochart South West London Elective Orthopaedic Centre, Epsom General Hospital, Epsom, Surrey, UK

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total hip replacement is to restore the normal anatomy, biomechanics and function of the hip joint ( 1 ), which is achieved by replacing the hip with a prosthesis comprising the femoral stem, the acetabular cup and the bearing surfaces. In order to

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David Lin Trauma and Orthopaedic Surgery Department, Royal London Hospital, UK

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Alexander Charalambous Trauma and Orthopaedic Surgery Department, Royal London Hospital, UK

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Sammy A. Hanna Trauma and Orthopaedic Surgery Department, Royal London Hospital, UK

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.8 Wang et al, 2014 12 26 33.7 (22–57) 128.4 (73–170) Standard, Link Germany Uncemented Peroneal nerve palsy (1) Calcar fracture (2) Acetabular osteolysis from poly wear (3) Aseptic loosening of cup (2) Aseptic loosening of stem (2

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