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Metal Allergy

  • Most common sensitizers are: nickel, cobalt, and chromium
  • Incidence of sensitivity: Chromium=0.2%, nickel=1.3%, and cobalt=1.8% (Swiontkowski MF,  J Orthop Trauma 2001; 15: 86-89).
  • Stainless steel and cobalt-chromium alloys contain the above sensitizers.
  • Titanium and titanium alloys generally do not contain the above sensitizers.
  • People with a history of allergies to cobalt, chromium or nickel generally are not sensitive to titanium or its common alloys. (Ti-6AL-4V)
  • Metal allergy may affect 10-15% of the population (Hallab N, JBJS 2001;83A:428). Prevalence may be increasing (Thyssen JP, Contact Dermatitis 2007;57:287).

Testing

TKA

  • Patients with metal allergy should be treated with a modular titanium or all poly tibial component and an oxidized zirconium femoral component. Titanium has a propensity for metallosis and is not suitable for the articulating portions of the components. (Laskin RS, CORR 2003;416:191).

References

  • Hallab N, JBJS 2001;83A:428
  • Thyssen JP, Contact Dermatitis 2007;57:287

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