Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_

Poster
Topic: Arthroplasty - Hip
Abstract number: 23745
METAL SENSITIVITY AFTER ARTHROPLASTY - A CONCERN REVISITED
S. THOMAS, R. DHARMARAJAN
Cumberland Infirmary, Carlsile, Newcastle Upon Tyne (UNITED KINGDOM)
Introduction: Although metal sensitivity to orthopaedic implants has been reported
several times, it still remains poorly understood. Metal implants frequently used in
Orthopaedic surgery are alloys of cobalt, chromium and molybdenum. Metal
implants have caused concerns as they are known to be potential allergens for the
general population. IncidenceIt is estimated that metal sensitivity affects about 10-
15% of the population. The reported immune reactions are usually eczema, redness
and itching. It is thought that following corrosion of the implants the electrochemical
changes trigger the immune system causing these reactions. The incidence of
contact allergy to nickel was 12% in females and 4% in males. Current literature
Many still consider metal sensitivity to be a contributing factor for implant failure and
recommend the removal of implants that have served its purpose. Other studies have
suggested that a history of metal allergy or sensitivity is not reliable and
recommendsthose patients about to undergo an arthroplasty have a patch testing pre
operatively. After assessing currently available literature we agree with that until well
designed studies are done to specifically look into the role of metal sensitivity in
implant failure the risk is considered to be minimal.Summary: Even though metal
sensitivity to Orthopaedic implants have been reported in arthroplasty, current
available literature suggests that with use of metal on plastic prosthesis, the
occurrence of allergy is minimal. Pre operative testing may be beneficial in those with
positive history.
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