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Poor Correlation Among Metal Hypersensitivity Testing Modalities and Inferior Patient-Reported Outcomes After Primary
Daniel N Bracey1, Vishal Hegde2, Roseann Johnson3
1Department of Orthopaedic Surgery, University of North Carolina, Chapel Hill, NC, USA.
Arthroplasty Today
|November 8, 2022
Summary
Metal allergy testing for total knee arthroplasty (TKA) shows inconsistent results. Patients with metal hypersensitivity may have poorer outcomes even with hypoallergenic implants, highlighting the need for improved testing and patient counseling.
Area of Science:
- Orthopedic Surgery
- Allergy and Immunology
- Biomaterials Science
Background:
- Metal allergy testing is considered for total knee arthroplasty (TKA) patients.
- Limited data exist on the consistency of various metal allergy testing methods.
- This study evaluates test agreement and clinical outcomes in TKA patients with and without metal hypersensitivity.
Purpose of the Study:
- To compare the agreement between different metal allergy testing modalities.
- To assess clinical outcomes in TKA patients with metal hypersensitivity versus controls.
- To inform clinical decision-making and patient counseling regarding metal allergies in TKA.
Main Methods:
- Retrospective review of 48 TKA patients (28 primary, 20 revision) with metal allergies diagnosed by skin patch testing (SPT), lymphocyte proliferation testing (LPT), or lymphocyte transformation testing (LTT).
- Assessed agreement between tests using percentage and kappa statistic.
- Compared postoperative outcomes to age-, BMI-, gender-, and follow-up-matched controls without metal hypersensitivity.
Main Results:
- Weak to minimal agreement observed between SPT, LPT, and LTT for various metals (nickel, cobalt, titanium, chromium, vanadium, zirconium, bone cement).
- Metal hypersensitivity patients undergoing primary TKA with hypoallergenic implants showed less improvement in functional scores and range of motion compared to controls.
- Revision TKA patients with metal hypersensitivity experienced worse clinical outcomes, particularly in functional scores, compared to controls.
Conclusions:
- Existing metal allergy tests demonstrate poor consistency, yielding conflicting results.
- Metal hypersensitivity may be associated with inferior clinical outcomes post-TKA, even with specialized implants.
- Enhanced clinician awareness of testing limitations and improved preoperative counseling are crucial for managing this patient group.
