Fig. 6

Radiographs of a chondroblastoma in the acetabulum. Radiographs at presentation (A), initial surgery (B), time of local recurrence (C), and last follow-up (D). Chondroblastoma in the acetabulum of a 15-year-old boy. The initial surgery performed was curettage. Thermal ablation was performed without using a high-speed burr during the initial surgery. Subsequently, artificial bone grafting was performed. After the initial surgery, remnants of translucency near the joint were observed, raising concerns regarding inadequate curettage and artificial bone grafting near the joint. The patient's pain improved postoperatively. However, 13 months after surgery, the symptoms flared up, and the translucent image near the joint enlarged, leading to a diagnosis of local recurrence. Four months after the second surgery, no local recurrence was observed. The Musculoskeletal Tumor Society (MSTS) score was 28