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From 1993 to 1998, 55 patients with osteoid osteoma were treated by ILP on an out-patient basis or 24 hours hospitalization. Patients ranged in age from 5 to 48 years. ILP was successful in 50 patients (91% success rate). Follow up ranged from 12 to 47 months, mean 56 months). Pain relief was observed to occur rapidly : 51 % of the patients were completely pain-free within 24 hours of the procedure, 48% were pain-free within 48-72 hours, 1 patient was pain-free only after 2 months due to a reflex sympathetic dystrophy syndrome. The day following the procedure 48% had moderate amount of pain, which was controlled by oral analgesics and were discharged the day of the intervention. 52% had substantial local pain and were hospitalized overnight for treatment with narcotics and were discharged on a regimen of oral medication within 24 hours of the procedure. The return to normal activities was prompt : most patients were able to return to work or school within a week. Treatment was unsuccessful in 5 patients. In one patient ILP was not performed because of the patient's agitation. In 4 patients pain recurred after variable pain-free periods ranging from 6 weeks to one year and CT examination revealed remaining nidus.