A and B, Anteroposterior and lateral radiographs of a 7-year-old boy with an osteoblastoma of the right lesser trochanter. C and D, Anteroposterior and lateral radiographs immediately after curettage and placement of a calcium sulfate/calcium phosphate bone graft substitute. E and F, Lateral radiographs 2 years later demonstrate remodeling of the bone with no sign of recurrence.