Ten-year-old girl with osteosarcoma of humerus. A, Anteroposterior radiograph of left humerus shows tumor extending down to distal diaphysis. B, Intraoperative photograph after wide resection of tumor. C, Humeral allograft is prepared to accept stem of tumor prosthesis. D, Allograft is fixed to remaining bone with medial and lateral plates. E, Prosthesis is cemented into allograft. F, Postoperative radiograph.