Metal Sensitization in Patients That Underwent Patch Test Pre and Post-Implant Exposure

Area of Science:

• Medical device safety
• Allergology
• Dermatology

Background:

• Metal sensitization can trigger allergic reactions in patients receiving medical implants.
• The utility of pre-implant patch testing for metal sensitization remains debated.

Purpose of the Study:

• To evaluate and compare metal sensitization rates in patients undergoing patch testing before and after medical device implantation.
• To identify factors associated with metal sensitization.

Main Methods:

• A retrospective analysis of 882 patients who underwent metal patch testing between January 1998 and December 2022.
• Patients were divided into pre-implant (n=665) and post-implant (n=217) groups.
• Patch testing included common implant metals; logistic regression analyzed sensitization factors.

Main Results:

• No significant difference in metal sensitization was observed between pre-implant and post-implant groups.
• Women were more frequently represented in both groups.
• A history of jewelry allergy was a significant predictor of metal sensitization, particularly in the pre-implant group.

Conclusions:

• Metal sensitization prevalence is comparable in patients tested before and after device implantation.
• Women with jewelry allergy are at increased risk for positive metal patch tests.
• Pre-implant patch testing may aid in selecting appropriate implants for at-risk individuals, while post-implant testing can identify allergens in symptomatic patients.