Metal hypersensitivity testing in patients undergoing joint replacement: a systematic review.

Area of Science:

• Orthopedic Surgery
• Biomaterials Science
• Immunology

Background:

• Metal hypersensitivity is a concern in patients undergoing total joint replacement (TJR).
• Understanding the post-operative risk and diagnostic utility of metal sensitivity testing is crucial for patient outcomes.

Purpose of the Study:

• To systematically review and meta-analyze the literature on metal sensitivity testing in TJR patients.
• To assess the risk of post-operative metal hypersensitivity and its association with TJR outcomes.
• To investigate the advantages and diagnostic value of hypersensitivity testing in TJR.

Main Methods:

• Systematic review and meta-analysis of peer-reviewed literature.
• Comprehensive search of PubMed and EMBASE databases.
• Inclusion of 22 articles involving 3634 patients.

Main Results:

• Positive metal sensitivity tests increased post-TJR, especially in cases of implant failure or metal-on-metal couplings.
• The odds of developing metal allergy were higher post-operatively (OR 1.52) and significantly increased with failed implants (OR 2.76).
• Hypersensitivity testing did not statistically differentiate between stable and failed TJRs, lacking proven predictive value.

Conclusions:

• Post-operative metal hypersensitivity is a recognized risk following total joint replacement.
• Metal sensitivity testing may be beneficial for TJR patients with a history of metal allergy or in cases of failed implants, particularly those with metal-on-metal components.
• Further research is needed to clarify the predictive value of hypersensitivity testing in TJR.