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Journal of Bone and Joint Surgery - British Volume, Vol 89-B, Issue 5, 586-590.
doi: 10.1302/0301-620X.89B5.18457  
Copyright © 2007 by British Editorial Society of Bone and Joint Surgery
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Metal ion levels after metal-on-metal Ring total hip replacement

A 30-YEAR FOLLOW-UP STUDY

P. Sauvé, FRCS, Specialist Registrar, Wessex1; J. Mountney, FRCS(Trauma & Orth), Specialist Registrar, Wessex1; T. Khan, FRCS, Specialist Registrar, Wessex1; J. De Beer, FCSOrtho (SA), Hip Arthroplasty Fellow1; B. Higgins, BSc, Senior Lecturer in Medical Statistics2; and M. Grover, FRCS, Consultant Orthopaedic Surgeon1

1 Portsmouth Hospitals NHS Trust, Queen Alexandra Hospital, Southwick Hill Road, Cosham PO6 3LY, United Kingdom.
2 University of Portsmouth, School of Health Sciences and Social Work, Gloucester House, Queen Alexandra Hospital, Southwick Hill Road, Cosham, Portsmouth PO6 3LY, United Kingdom.

Correspondence should be sent to Mr P. Sauvé; e-mail: philsauve{at}doctors.org.uk

Metal-on-metal bearings for total hip replacement (THR) are becoming increasingly popular. Improved wear characteristics mean that these articulations are being inserted into younger patients in the form of THR and resurfacing procedures. This has led to concerns regarding potential carcinogenicity because of the increased exposure to metal ions that the procedure brings.

We have studied the serum cobalt and chromium concentrations in patients who had primary, well-fixed Ring metal-on-metal THRs for more than 30 years. The levels of cobalt and chromium were elevated by five and three times, respectively compared with those in our reference groups. Metal-on-metal articulations appear to be the source of metal ions throughout the life of the prosthesis. In three patients who had undergone revision of a previous metal-on-metal THR to a metal-on-polyethylene replacement the levels of metal ions were within the normal range. The elevations of cobalt and chromium ions seen in our study were comparable with those in patients with modern metal-on-metal THRs.




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[Abstract] [Full Text] [PDF]


(c) British Editorial Society of Bone and Joint Surgery All Rights Reserved
Registered charity no: 209299     Print ISSN: 0301-620X
Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General