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Journal of Bone and Joint Surgery - British Volume, Vol 85-B, Issue 1, 31-36.
doi: 10.1302/0301-620X.85B1.12925  
Copyright © 2003 by British Editorial Society of Bone and Joint Surgery
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The relationship between cup design and the radiological signs of aseptic loosening in total hip arthroplasty

U. Müller, MD, MBA, Orthopaedic Surgeon, Senior Research Fellow1; E. Gautier, MD, Orthopaedic Surgeon2; C. Roeder, MD, Orthopaedic Surgeon1; and A. Busato, PD, DrMsc, Associate Professor of Clinical Epidemiology1

1 Maurice E. Müller Research Centre for Orthopaedic Surgery, University of Bern, Murtenstrasse 35, PO Box 8354, CH-3008 Bern, Switzerland.
2 Service de Chirurgie Orthopèdique, Hôpital Cantonal Fribourg, Fribourg, Switzerland.

Correspondence should be sent to Dr A. Busato.

We assessed differences in the incidence and appearance of the radiological signs of loosening of the cup for various types of design. This was an observational study based on hip registry data of 15 340 patients with 17 951 total hip arthroplasties collected over a period of 33 years in 49 hospitals in Central Europe.

The threaded and the press-fit titanium cups showed significantly less aseptic loosening than the other systems. The direction of migration and the frequency of the radiological signs of loosening differed between the cup systems and were time-dependent.

Our findings indicate the superiority of uncemented threaded cups and press-fit titanium cups over other designs of cup.




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[Abstract] [Full Text] [PDF]


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Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General