Metal Braces Are NOT a Contraindication to Thyroid Nodule Radiofrequency Ablation
Metal orthodontic braces do not represent a contraindication to percutaneous radiofrequency ablation (RFA) of thyroid nodules. The most recent and comprehensive guidelines on thyroid thermal ablation do not list metal dental appliances or orthodontic braces among the contraindications for RFA procedures.
Evidence from Current Guidelines
The 2025 Chinese guidelines for ultrasound-guided thermal ablation of thyroid nodules 1 and the 2022 French SFE-AFCE-SFMN consensus 2 provide detailed lists of contraindications for thermal ablation procedures. Neither guideline mentions metal braces, dental work, or orthodontic appliances as contraindications.
Key Technical Considerations
The concern about metal braces likely stems from theoretical electromagnetic interference, but this is not clinically relevant for RFA because:
- RFA uses localized radiofrequency energy delivered through a cooled electrode (typically 18G) directly into the thyroid nodule tissue 2
- The energy field is highly localized to the treatment area in the neck
- Metal braces in the oral cavity are sufficiently distant from the ablation zone to avoid any interference or safety concerns
Actual Contraindications to Be Aware Of
The guidelines specify that pre-procedural evaluation should focus on 2, 1:
- Coagulation disorders - requiring normal platelet count and coagulation studies
- Active thyroid infection or inflammation
- Pregnancy
- Uncontrolled hyperthyroidism (for certain nodule types)
- Inability to cooperate with the procedure or maintain proper positioning
For patients with pacemakers, laser ablation (LA) is specifically recommended as an alternative to RFA 2, as electromagnetic interference is a genuine concern with cardiac devices. This distinction highlights that when metal devices pose actual risks, guidelines explicitly address them.
Clinical Bottom Line
Proceed with RFA in patients with orthodontic braces without concern. The pre-procedural evaluation should focus on the actual contraindications outlined in guidelines: ensuring adequate coagulation parameters, confirming benign cytology on at least two separate biopsies, assessing anatomical relationships with neurovascular structures, and evaluating patient ability to tolerate the procedure 2, 1.
The absence of metal braces from any contraindication list across multiple international guidelines, combined with the localized nature of RFA energy delivery, provides strong evidence that this is not a clinical concern requiring procedural modification or delay.