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Dongmei Wu School of Medicine, University of St. Andrews, St. Andrews, Fife, United Kingdom

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Rohan M Bhalekar ExplantLab, The Biosphere, Newcastle Helix, Newcastle-upon-Tyne, United Kingdom

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Jordan S Marsh School of Medicine, University of St. Andrews, St. Andrews, Fife, United Kingdom

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David J Langton ExplantLab, The Biosphere, Newcastle Helix, Newcastle-upon-Tyne, United Kingdom

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Alan J Stewart School of Medicine, University of St. Andrews, St. Andrews, Fife, United Kingdom

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hypersensitivity. Langton et al . found that severe ALVAL was related to the elevations of cobalt and chromium concentration in joint fluids ( 26 ). A positive association between blood metal ion concentrations and ALVAL was also noted in failed MoM HA ( 27 , 28

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Theofilos Karachalios School of Health Sciences, Faculty of Medicine, University of Thessalia, University General Hospital of Larissa, Mezourlo Region, 41110 Larissa, Greece

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George Komnos Orthopaedic Department, University General Hospital of Larissa, Greece

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Antonios Koutalos Orthopaedic Department, University General Hospital of Larissa, Greece

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recent advances in THA technique and improved outcomes, we must still pose the question: why do some THAs fail, leading to technically complicated and expensive revision surgery? This question is of particular importance nowadays at a time when economic

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Zeng Li Department of Orthopedics, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangdong, China
Department of Orthopaedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing, China
These authors contributed equally to the manuscript

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Shuai Xiang Department of Joint Surgery, the Affiliated Hospital of Qingdao University, Qingdao, Shandong, China
These authors contributed equally to the manuscript

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Cuijiao Wu Department of Histology & Embryology, Qingdao University Medical School, Qingdao, Shandong, China

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Yingzhen Wang Department of Joint Surgery, the Affiliated Hospital of Qingdao University, Qingdao, Shandong, China

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Xisheng Weng Department of Orthopaedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Science, Beijing, China

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by contact with the original investigators and, if that failed, calculated with available data. Notably, if the data were presented as median with interquartile range or median with range, the mean and standard deviation were calculated using the

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Alexis Nogier Service de Chirurgie Orthopédique, Clinique Trenel, Sainte-Colombe, France
Service de Chirurgie Orthopédique, Clinique Maussins-Nollet, Paris, France
Clinique Nollet, Paris, France

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Idriss Tourabaly Service de Chirurgie Orthopédique, Clinique Maussins-Nollet, Paris, France
Clinique Nollet, Paris, France

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Sonia Ramos-Pascual ReSurg SA, Nyon, Switzerland

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Jacobus H. Müller ReSurg SA, Nyon, Switzerland

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Mo Saffarini ReSurg SA, Nyon, Switzerland

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Cyril Courtin Service de Chirurgie Orthopédique, Clinique Trenel, Sainte-Colombe, France

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failed to fit adequately; however, this was not in the primary THA group, but in the first revision THA case. Bargar 9 reported that during revision surgery “an unrecognized open-section defect was present laterally from a guttering of the femur at an

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Joseph J Ruzbarsky Steadman Philippon Research Institute, Vail, Colorado, USA
Steadman Clinic and United States Coalition for the Prevention of Illness and Injury in Sport, Vail, Colorado, USA

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Rui W Soares Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, Ohio, USA

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Spencer M Comfort Steadman Philippon Research Institute, Vail, Colorado, USA

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Justin W Arner Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA

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Marc J Philippon Steadman Philippon Research Institute, Vail, Colorado, USA
Steadman Clinic and United States Coalition for the Prevention of Illness and Injury in Sport, Vail, Colorado, USA

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, labral tears, and extra-articular tendon pathologies. FAI results from bony incongruity between the femoral head (cam impingement), the acetabulum (pincer impingement), or both (mixed impingement). When conservative treatments fail, hip arthroscopy has

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Oliver Marin-Peña Orthopedic Surgery and Traumatology, University Hospital Infanta Leonor, Madrid, Spain

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Marc Tey-Pons Hospital del Mar, Barcelona, Spain

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Luis Perez-Carro Clinica Mompia Santander, Spain

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Hatem G. Said Assiut University Hospital, Assiut, Egypt

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Pablo Sierra Madrid. University Hospital Torrejon, Madrid, Spain

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Pedro Dantas Hospital CUF Descobertas, Lisboa, Portugal

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Richard N. Villar Spire Cambridge Lea Hospital, Cambridge, UK

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flexion such as ballet. The patient only rarely experiences severe pain and conservative treatment should be the ‘gold standard’. When conservative options fail, arthroscopic tenotomy of the psoas tendon can relieve the symptoms. Arthroscopic psoas

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Daniel Petek Clinic of Orthopaedics and Trauma Surgery, HFR-Fribourg District Hospitals, Fribourg, Switzerland

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Didier Hannouche Clinic of Orthopaedics and Trauma Surgery, Geneva University Hospitals, Geneva, Switzerland

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Domizio Suva Clinic of Orthopaedics and Trauma Surgery, Geneva University Hospitals, Geneva, Switzerland

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. However, the authors concluded that there was no standard protocol described and the conversion for further surgery might be difficult. 68 Tanzer et al published a study of 17 failed porous rods out of 113 implanted (15%). The patients all had a pre

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George C. Babis 2nd Department of Orthopaedics, School of Medicine, National and Kapodistrian University of Athens, Konstantopouleio Hospital, Greece

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Vasileios S. Nikolaou 2nd Department of Orthopaedics, School of Medicine, National and Kapodistrian University of Athens, Konstantopouleio Hospital, Greece

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, regardless of the classification, there is general agreement that attempting to insert a standard hemispheric cap alone is prone to fail. In such cases variable degree complex reconstruction techniques have to be employed depending on the amount of associated

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Konrad Sebastian Wronka Department Of Orthopaedics, Prince Philip Hospital, Hywel Dda University Healthboard, Llanelli, UK

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Michell Gerard-Wilson Department Of Orthopaedics, Prince Philip Hospital, Hywel Dda University Healthboard, Llanelli, UK

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Elizabeth Peel Department Of Orthopaedics, Prince Philip Hospital, Hywel Dda University Healthboard, Llanelli, UK

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

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Peter Herman Johan Cnudde Department Of Orthopaedics, Prince Philip Hospital, Hywel Dda University Healthboard, Llanelli, UK
Department Of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, Gothenburg, Sweden

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with extended trochanteric osteotomy fully healed. Correcting varus deformity of the proximal femur A loose, short femoral component can cause the varus remodelling of the proximal femur. This usually occurs at the tip of the failed

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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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.4%); there were also three infection cases with unspecified type of fixation. The infection rate of studies varied between 0% and 33%. Long-term follow-up studies reported infection rate between 3% and 6.7%. 16 , 21 , 22 Fifty-seven THAs were failed due

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