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The mean age of the patients was 56 years (28 to 74) and 85 hips (40%) were in 78 women.<\/jats:p><jats:p>The mean Harris hip score improved from 52 (11 to 81) to 95 (27 to 100) at two years and the mean University of California, Los Angeles activity score from 3.9 (1 to 10) to 7.4 (2 to 10) in the same period. Narrowing of the neck (to a maximum of 9%) was noted in 124 of 209 hips (60%). There were 12 revisions (5.6%) involving four (1.9%) early fractures of the femoral neck and two (0.9%) episodes of collapse of the femoral head secondary to avascular necrosis. Six patients (2.8%) had failure related to metal wear debris. The overall survival for our series was 93% (95% confidence interval 80 to 98) and 89% (95% confidence interval 82 to 96) for hips with acetabular components smaller than 56 mm in diameter.<\/jats:p><jats:p>The ASR implant has a lower diametrical clearance and a subhemispherical acetabular component when compared with other more frequently implanted metal-on-metal hip resurfacings. These changes may contribute to the higher failure rate than in other series, compared with other designs. Given our poor results with the small components we are no longer implanting the smaller size.<\/jats:p>","DOI":"10.1302\/0301-620x.92b1.22769","type":"journal-article","created":{"date-parts":[[2010,1,1]],"date-time":"2010-01-01T00:22:43Z","timestamp":1262305363000},"page":"28-37","source":"Crossref","is-referenced-by-count":53,"title":["Articular Surface Replacement of the hip: a prospective single-surgeon series"],"prefix":"10.1302","volume":"92-B","author":[{"given":"S. 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