We report a giant cell tumor of the femur recurring 16 years after the cement packing method. A 59-year-old man was treated surgically with curettage, bone grafting and cement packing method for a giant cell tumor on one of his femurs in 1985. Part of plain radiograph indicated radiolucent area on the subchondral bone at an early stage, but the size of this radiolucent area did not change until 1994. In 2001 (16 years later), he experienced knee pain, and we observed enlargement of the radiolucent area on his radiograph. We suspected recurrence of the giant cell tumor on the bone, osteoarthritis or bone cyst as a result of examination. We performed surgical treatment of this lesion with curettage, bone grafting and hydroxyapatite packing. Pathological diagnosis indicated recurrence of giant cell tumor.
