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We have reviewed the results of the use of the Ultima hybrid metal-on-metal total hip replacement, with a cemented polished tapered femoral component with a 28 mm diameter and a cobalt-chrome (CoCr) modular head, articulating with a 28 mm CoCr acetabular bearing surface secured in a titanium alloy uncemented shell. <\/jats:p><jats:p> Between 1997 and 2004, 545 patients with 652 affected hips underwent replacement using this system. Up to 31 January 2008, 90 (13.8%) hips in 82 patients had been revised. Pain was the sole reason for revision in 44 hips (48.9%) of which 35 had normal plain radiographs. Peri-prosthetic fractures occurred in 17 hips (18.9%) with early dislocation in three (3.3%) and late dislocation in 16 (17.8%). Infection was found in nine hips (10.0%). <\/jats:p><jats:p> At operation, a range of changes was noted including cavities containing cloudy fluid under pressure, necrotic soft tissues with avulsed tendons and denuded osteonecrotic upper femora. Corrosion was frequently observed on the retrieved cemented part of the femoral component. Typically, the peri-operative findings confirmed those found on pre-operative metal artefact reduction sequence MRI and histological examination showed severe necrosis. <\/jats:p><jats:p> Metal artefact reduction sequence MRI proved to be useful when investigating these patients with pain in the absence of adverse plain radiological features. <\/jats:p>","DOI":"10.1302\/0301-620x.92b11.24504","type":"journal-article","created":{"date-parts":[[2010,11,1]],"date-time":"2010-11-01T00:08:19Z","timestamp":1288570099000},"page":"1501-1508","source":"Crossref","is-referenced-by-count":66,"title":["Early failure of the Ultima metal-on-metal total hip replacement in the presence of normal plain radiographs"],"prefix":"10.1302","volume":"92-B","author":[{"given":"S. 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