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HomeOpinion on the safety of metal-on-metal joint replacements with a particular focus on hip implants
Opinion on the safety of metal-on-metal joint replacements with a particular focus on hip implants
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European Commission asked the SCENIHR for a scientific opinion to assess the safety of Metal-on-Metal joint replacements with a particular focus on hip implants. There are two commonly used types of total hip arthroplasty (THA) (i) "stemmed" implants consisting of a ball head (either small-head diameter < 36 mm or large-head diameter ≥ 36 mm), which replaces the entire femoral head, connected to a stem embedded in the femur as well as a cup embedded in the acetabulum. If both head and cup are metal, the implant is called “metal-on-metal” (MoM) total hip arthoplasty; (ii) "hip resurfacing arthroplasty" (HRA) in which the femoral head is resurfaced without a stem and a cup embedded in the acetabulum; both components in HRA consist of metal alloys and are always large diameter. All types of MoM hip arthroplasties release metals in terms of particles, ions and/or metalloorganic compounds. The deposition of these substances in body fluids and tissue may lead to local and/or systemic adverse health effects. MoM implants with large diameters (large-head MoM THA and HRA) show the highest incidence of local reactions. For systemic health effects, no association with the type of implant or diameter has been established. Local as well as systemic adverse effects can also occur with other types of metallic implants (e.g. plates, screws).
- Published:
- Corporate author(s): Directorate-General for Health and Consumers (European Commission)
- Themes: Public health , Medical and biological research
- Subject: advanced materials , health care , health risk , medical device , medical research , medical science , public health , special metal , toxic substance
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| ISSN 1831-4783 | ISBN 978-92-79-30135-3 | DOI 10.2772/76284 | Catalogue number ND-AS-13-005-EN-N |
- Released on EU Publications:
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