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Cup size and risk of dislocation after primary total hip arthroplasty

Published in Journal of Arthroplasty. 2011, vol. 26, no. 8, p. 1305-9
Abstract We evaluated the relationship between cup diameter and dislocation risk in patients undergoing primary total hip arthroplasty (THA) with a 28-mm head. There were 50 dislocations, 28 of which occurred in 2221 (1.3%) THAs with a cup diameter smaller than 56 mm and 22 in 513 (4.3%) with a cup diameter of 56 mm or larger. Dislocation risk varied between 0.6% and 2.4% in the smaller cup group and between 4.1% and 5.2% in the larger cup group. The risk was substantially higher in the large cup group (unadjusted odds ratio, 3.5; 95% confidence interval, 2.0-6.2). Multivariable logistic regression revealed an adjusted odds ratio of 2.4 (95% confidence interval, 1.2-4.9). Patients with THA (28-mm head) had more than twice the risk of dislocation with cup size of 56 mm or higher compared to patients with smaller cups.
Keywords AgedAged, 80 and overArthroplasty, Replacement, Hip/instrumentation/methodsCohort StudiesFemaleFemur Head/pathology/surgeryHip Dislocation/epidemiologyHip Joint/surgeryHip ProsthesisHumansIncidenceLogistic ModelsLongitudinal StudiesMaleMiddle AgedOsteoarthritis, Hip/surgeryProspective StudiesProsthesis DesignProsthesis FailureRetrospective StudiesRisk FactorsTreatment Outcome
PMID: 21414747
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Research groups Chirurgie orthopédique et traumatologique (98)
Traumatologie ostéoarticulaire (99)
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PETER, Robin et al. Cup size and risk of dislocation after primary total hip arthroplasty. In: Journal of Arthroplasty, 2011, vol. 26, n° 8, p. 1305-9. doi: 10.1016/j.arth.2010.11.015 https://archive-ouverte.unige.ch/unige:24920

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Deposited on : 2013-01-03

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