Cookies on this website
We use cookies to ensure that we give you the best experience on our website. If you click 'Continue' we'll assume that you are happy to receive all cookies and you won't see this message again. Click 'Find out more' for information on how to change your cookie settings.

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.

Original publication




Journal article


The Journal of arthroplasty

Publication Date





1305 - 1309


Division of Orthopaedics and Trauma Surgery, University Hospitals of Geneva, Geneva, Switzerland.


Femur Head, Hip Joint, Humans, Osteoarthritis, Hip, Hip Dislocation, Prosthesis Failure, Treatment Outcome, Arthroplasty, Replacement, Hip, Incidence, Logistic Models, Risk Factors, Retrospective Studies, Cohort Studies, Longitudinal Studies, Prospective Studies, Prosthesis Design, Hip Prosthesis, Aged, Aged, 80 and over, Middle Aged, Female, Male