Abstract
Osteoid osteoma has been known to occur in practically every bone of appedicular and axial skelton. However the intraarticular localization close to articular surface is considered to be rare. This paper presented an 18-year-old boy with osteoid osteoma in the hip joint. Initial symptom and sign were pain and limitation of movement. Nidus formation was not clear on serial X-ray films. Final diagnosis was made by histological examination of biopsy specimen at fifteen months after the initial symptom.
