Osteoid osteoma: Percutaneous treatment with radiofrequency energy

PURPOSE: To report our experience with technical success, complications, and long-term clinical success of radiofrequency (RF) ablation of osteoid osteoma. MATERIALS AND METHODS: After needle biopsy, computed tomography (CT)-guided percutaneous RF ablation was performed with general or spinal anesthesia. With an RF electrode, the lesion was heated to 90degreesC for 6 minutes. Patient age and biopsy results, and complications were recorded. lesion size and location sex,, Clinical success was assessed at a minimum of 2 years after the procedure. Significance of patient age and sex and lesion location and size as a predictor of biopsy result was tested by means of chi(2) analysis. In addition, effects of patient age and sex, lesion location and size, and biopsy results on clinical success were tested with the Fisher exact test. RESULTS: During an 11-year period, 263 patients who were suspected of having osteoid osteoma underwent 271 ablation procedures. All procedures were technically successful. There were two anesthesia-related complications (aspiration, cardiac arrest) and two minor procedure-related complications (cellulitis, sympathetic dystrophy). Results at biopsy were positive in 73% (197 of 271 biopsies). Two-year follow-up data were available for 126 procedures. The other procedures had been performed more recently or the patients could not be contacted. There was complete relief of symptoms after 112 of the 126 procedures (89%). For procedures performed as the initial treatment, the success rate was 91% (107 of 117 procedures). Procedures for recurrent lesions had a significantly lower success rate (six of 10 procedures [60%], P < .001). Clinical outcome was not dependent on biopsy result, patient age or sex, or lesion size or location. CONCLUSION: CT-guided percutaneous RF ablation of osteoid osteoma is a safe and effective technique. (C) RSNA, 2003.