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with bilateral THA and different bearings, the peak temperature was 43.1 °C in the polyethylene cup and 41.4 °C in the alumina ceramic cup. During cycling the average peak force was 45% of the value during walking, and the peak temperatures after
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situation – Metal-on-metal bearings Since dislocation was one of the most frequent revision reasons, larger heads were used more frequently, starting around 2004, to reduce the dislocation risk. 6 Since larger heads generate more wear against
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Introduction Large-head metal-on-metal (MoM) bearings were re-popularised in the late 1990s with the introduction of modern hip resurfacing (HR), followed shortly afterward by large metal head total hip arthroplasty (THA). The introduction of
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-bearing versus fixed-bearing UKA There is controversy in the literature regarding which type of bearing is preferable: mobile or fixed. In 2015, Ko et al reported a systematic review of comparative studies between fixed and mobile bearings focussing on
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multidirectional stresses, they often have complications: wear of the bearings, loosening or patellar complications. 10 Their worse outcomes compared to unconstrained implants, as well as higher infection rates, have reduced their use in some neurological
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, 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 ). Sørensen et al. ( 59 ) believed that although the revision rate for MoM bearings may be decreased by better prostheses design, surgery performed only by high-volume surgeons, and careful
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Distal humeral replacement and the total elbow are two commonly-used arthroplasties
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Each prosthesis has evolving indications and surgical techniques
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Recent changes in device design and implantation methods are due to biomechanical and clinical outcome-based research
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New prostheses and methods provide: better elbow kinematics, more durable bearings and longer-lasting joint replacement potential
Cite this article: EFORT Open Rev 2017;2:83-88. DOI: 10.1302/2058-5241.2.160064
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with the study of friction, wear, and lubrication”. 1 Tribology is fundamental to the function and long-term survival of orthopaedic implants. With the development of hip implants with metal-on-polyethylene (MoP) bearings in the early 1960s
Department of Orthopaedic Surgery, Vejle Hospital, Vejle, Denmark
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Department of Orthopaedic Surgery and Traumatology, Odense University Hospital, Odense, Denmark
Orthopaedic Research Unit, Department of Clinical Research, University of Southern Denmark, Odense, Denmark
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will be illustrated based on a study by Varnum et al 9 published in 2015: the aim was to compare cementless THA with ceramic-on-ceramic (CoC) bearings with metal-on-polyethylene (MoP) bearings in patients identified from the DHR. This was a
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CIBER Epidemiología y Salud Pública (CIBERESP), Madrid, Spain
Instituto de Biomedicina (IBIOMED). Universidad de León, León, Spain
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Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK
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Introduction Metal-on-metal (MoM) bearings have been used since the early years of total hip replacement (THR). Early historical MoM prostheses from the 1960s, 1970s and 1980s include the McKee Farrar hip and the Ring hip prostheses. 1
