Safety of Spine Radiofrequency Procedures

Mayo Clinic

Status: Completed

Conditions: Radiofrequency Ablation in Patients With Spinal Hardware

Treatments: Device: Radiofrequency cannula

Study type: Interventional

Funder types: Other

Identifiers

NCT02210052

14-003619

Details and patient eligibility

About

The goal of the study was to determine if patients undergoing radiofrequency neurotomy (RFN) of lumbar facet joints that are adjacent to previously placed pedicle screws from a fusion, would lead to an increase in the temperature of the pedicle screws.

Full description

This study was a prospective clinical trial, examining outcomes related to temperature increases in pedicle screws. It was not possible to blind the investigators or the patient. Outcomes related temperature differences were collected at each pedicle screw adjacent to a zygapophyseal joint being treated.

A conventional 18-gauge, 1-cm curved active tip radiofrequency cannula was placed under fluoroscopic guidance to the area to be treated (the junction of the transverse process and the superior articulating process of the facet joint). This position placed the tip of the radiofrequency cannula immediately adjacent to, but not in direct contact with, the pedicle screws. The radiofrequency cannula was connected to a radiofrequency generator, and the conventional settings for clinical medial branch neurotomy was used, heating the tissue to 80°C for 90 seconds. The procedure described up to this point is the normal procedure and protocol for RFN performed at the Mayo Clinic.

The experimental portion of the procedure is as follows: A separate 22 gauge radiofrequency cannula was intentionally placed in direct contact with the dorsal surface of the pedicle screws and was connected to a radiofrequency generator solely for the purpose of measuring temperature, as the RF cannula are dual purpose probes capable of both conducting energy for the radiofrequency lesion and monitoring tissue temperature. In other words, this small gauge needle was placed for the sole purpose of acting as a thermistor probe/temperature monitor. This process was repeated for each level necessary for treatment.

Enrollment: 6 patients

Sex: All

Ages: 18 to 100 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Scheduled for Radiofrequency procedure AND has spinal hardware placed from a previous spinal surgery

Exclusion criteria

• Active infection over skin where needle will be placed
• Coagulopathy
• Pregnancy

Trial design

Primary purpose: Screening

Allocation: N/A

Interventional model: Single Group Assignment

Masking: None (Open label)

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6 participants in 1 patient group

Radiofrequency neurotomy subjects

Experimental group

Description:

Subjects with spinal hardware that are undergoing radiofrequency ablation procedures will have an additional radiofrequency cannula placed at the site of adjacent pedicle screws for temperature measurement only.

Treatment:

Device: Radiofrequency cannula