Aims: Osteoid osteomas are benign bone-forming tumors which usually occur in long bones of young males. Its most significant finding is severe pain caused by nidus, increasing during nights. The application of radiofrequency ablation is becoming a widespread treatment method. In this case presentation, the aim is to discuss the application of radiofrequency ablation with its different aspects Case Report: Fourteen-year-old male patient had a history of left knee pain for 3 years. After his consultation at Trakya University Orthopaedics and Traumatology Outpatient Clinic, it was confirmed that the pain increases during night and it is localized in left thigh. According to these symptoms, radiological examinations performed to the patient. Taking radiology tests results into consideration, the patient was diagnosed with osteoid osteoma and treated by radiofrequency ablation. Conclusion: Osteoid osteoma is a surgical bone lesion but in late period radiofrequency ablation replaces open surgery because it has a lower risk of relapse, faster recovery, shorter hospitalization time and faster ambulation.