Hypersensitivity to biomedical implants: Prevention and diagnosis

Area of Science:

• Immunology
• Biomedical Engineering
• Dermatology

Background:

• Growing interest in adverse immunologic reactions to metals in biomedical devices.
• Increasing referrals for metal hypersensitivity reactions in orthopedic, cardiac, gynecologic, and dental implants.
• Limited evidence-based recommendations for evaluating metal hypersensitivity in clinical practice.

Purpose of the Study:

• To provide evidence-based recommendations for evaluating metal hypersensitivity to biomedical devices.
• To guide clinicians in pre- and post-implantation evaluation of delayed hypersensitivity reactions.
• To address the management of patients with suspected metal hypersensitivity.

Main Methods:

• Review of evidence and expert opinion on biomedical device hypersensitivity.
• Analysis of published guidelines for evaluating delayed hypersensitivity reactions.
• Focus on pre- and post-implantation evaluation strategies.

Main Results:

• Routine pre-implantation metal hypersensitivity evaluation is not necessary for all patients.
• Patch testing may benefit patients with a history of significant metal hypersensitivity before implantation.
• Post-implantation patch testing can be considered for unexplained implant failure or dermatitis, after ruling out other causes.
• Positive patch test results do not confirm causality; shared decision-making is crucial for implant revision.

Conclusions:

• Consensus guidelines for evaluating hypersensitivity to biomedical devices are available for practicing physicians.
• Further investigations are ongoing to refine evaluation and management strategies.
• Clinical decision-making requires a multidisciplinary approach involving patients, allergists/dermatologists, and surgeons.