Allergies in orthopaedic and trauma surgery

Area of Science:

• Orthopaedic Surgery
• Immunology
• Biomaterials Science

Background:

• Hypersensitivity reactions to orthopaedic implants are rare but severe complications.
• These reactions are typically delayed-type (Type IV) hypersensitivity, involving T-lymphocytes and cytokine release, potentially causing bone resorption.
• Metal alloys and bone cement are common sources of antigens (haptens).

Purpose of the Study:

• To review the current understanding of hypersensitivity reactions to orthopaedic implants.
• To discuss diagnostic approaches and treatment strategies for patients experiencing implant hypersensitivity.
• To highlight the need for further research and development of predictive biomarkers.

Main Methods:

• Literature review and meta-analysis of existing studies on implant hypersensitivity.
• Discussion of various diagnostic tests including patch testing, lymphocyte transformation test (LTT), and memory lymphocyte immunostimulation assay (MELISA).
• Analysis of treatment outcomes for patients with suspected metal or bone-cement hypersensitivity.

Main Results:

• Meta-analysis confirms a higher incidence of metal hypersensitivity and increased risk of implant failure.
• Symptoms vary widely, including pain, effusion, delayed healing, and implant instability.
• No significant differences found between in vivo and in vitro diagnostic methods; predictive tests not routinely recommended.
• Management is individualized, with alternative implant materials showing promise but lacking long-term data.

Conclusions:

• Hypersensitivity to orthopaedic implants necessitates careful diagnosis and individualized management.
• Avoiding suspected causative agents (metals or bone cement components) is crucial.
• Further large-scale studies and development of predictive biomarkers are essential for improved patient outcomes.