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Roentgen stereophotogrammetric analysis was performed to assess migration of the prosthesis. <\/jats:p><jats:p> The mean clinical follow-up was 3.0 years (2.2 to 4.8) and the radiological follow-up was 2.7 years (2.0 to 4.8). At the latest review six patients had died and none was lost to follow-up. There were four acetabular revisions, three for aseptic loosening and one for deep infection. Another acetabular component was radiologically loose with progressive radiolucent lines in all Gruen zones and was awaiting revision. The overall rate of aseptic loosening was 11.8% (4 of 34). Roentgen stereophotogrammetric analysis in the non-revised components confirmed migration of up to 1.06 mm of translation and 2.32\u00b0 of rotation at 24 months. There was one case of dislocation and dissociation of the component in the same patient. Of the 34 patients, 33 (97.1%) had no further episodes of dislocation. <\/jats:p><jats:p> The constrained acetabular component reported in our study was effective in all but one patient with instability of the hip, but the rate of aseptic loosening was higher than has been reported previously and requires further investigation. <\/jats:p>","DOI":"10.1302\/0301-620x.88b7.17644","type":"journal-article","created":{"date-parts":[[2006,6,23]],"date-time":"2006-06-23T19:55:49Z","timestamp":1151092549000},"page":"870-876","source":"Crossref","is-referenced-by-count":50,"title":["A constrained acetabular component for recurrent dislocation"],"prefix":"10.1302","volume":"88-B","author":[{"given":"R. J. 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