Air-blocking ablation of osteoid osteoma; a technical note

Area of Science:

• Orthopedics
• Interventional Radiology

Background:

• Osteoid osteoma is a common benign bone tumor, typically treated with surgery.
• Percutaneous radiofrequency ablation (RFA) became a primary treatment in 1992, offering a less invasive option.
• While RFA is generally effective, disease recurrence has been documented.

Observation:

• A case is presented where RFA for osteoid osteoma was delayed due to air surrounding the ablation probe.
• The presence of air was found to impede radiofrequency energy transmission.
• Saline injection was used to displace air, enabling successful ablation.

Findings:

• Air surrounding the ablation probe can decrease radiofrequency energy transmission.
• Partial air in the ablation site may contribute to early disease recurrence after RFA.
• Injecting saline through the introducer needle is a simple measure to displace air and ensure effective ablation.

Implications:

• This technique can prevent complications associated with air in the ablation field.
• Saline injection may enhance the reliability and efficacy of RFA for osteoid osteoma.
• Addressing air presence could potentially reduce recurrence rates for osteoid osteoma treated with RFA.