Osteoid osteoma is a benign osteogenic disorder, the incidence of which accounts for 2% to 3% of bone tumors and 10% to 20% of all benign bone tumors. Osteoid osteoma belongs to benign osteogenic bone tumors, which are usually found in children and adolescents, preferably in the long bones of the lower limbs. They usually present with pain in the affected area, and young children may have a limp or be reluctant to walk due to pain. If osteoid osteoma occurs in the joints, it may lead to synovitis and reactive arthritis, which may cause joint mobility problems. Although osteoid osteoma is not a serious disease, persistent pain may affect children’s normal activities, and some children may develop osteoporosis and muscle atrophy. Therefore, it is important to go to the hospital in time when the above symptoms occur, and the doctor will choose conservative treatment or surgical treatment according to the specific condition, please follow the doctor’s instructions.