• Donato Mastrantuono, Domenico Martorano, Valter Verna, Andrea Mancini, and Carlo Faletti.
• Dipartimento di Diagnostica per Immagini, U.O.A. di Radiologia Diagnostica C.T.O., Turin.
• Radiol Med. 2005 Mar 1; 109 (3): 220-8.

PurposeTo present the results of two years experience with a minimally invasive radio-frequency technique designed by our team in the treatment of osteoid osteoma.Materials And MethodsA total of 21 osteoid osteoma patients (15 males, 6 females, age range 13 to 34 yrs) were treated between January 2001 and April 2003. Localizations of the osteoid osteoma were the pelvis (n = 1), the femur (n = 12), the tibia (n = 3), the foot (n = 3), and the humerus (n = 2). All patients underwent an X-ray examination, a CT scan and a bone Scintiscan. In the initial phase, a K-wire just slightly larger than the 17G needle electrode is positioned manually at the zenith of the target area under CT guidance and using an orthopaedic drill it is inserted at the centre of the nidus. A tailor-made metal sheath is inserted on the K-wire to create a ''tunnel'' through which the needle electrode can substitute the K-wire; at the same time, the electrode needle is positioned inside the lesion. The temperature of the exposed tip of the needle is 90 degrees C and duration of hyperthermia is 6 minutes on average. Once the procedure has been completed, a scan os performed to measure the density of the treated site and this measurement is then used as an evolution index for the evaluation of the healing process during follow-up.ResultsNo serious complications were observed at follow-up. General anaesthesia was only required in the case with hip involvement; peripheral anaesthesia was used in all the other cases. Complete resolution of the pain was reported in all cases after a maximum of three weeks.Discussion And ConclusionsAfter two years experience, we believe percutaneous RF treatment of osteoid osteoma to be the first choice technique when compared to traditional surgery due to the fact that it is almost non-invasive, quick, repeatable if need be and offers a high reduction in costs. Moreover early weight bearing is the norm and the patient is dismissed after only one day of hospitalization. The clinical results indicate a 100% success rate with complete remission of symptoms and no relapses having been reported at the time of writing for those patients who have arrived at the two year follow up (4 out of 21).

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