Fig. 3

Case 21. A case of stage IIA osteosarcoma in distal femur. a and b Anteroposterior and lateral X-ray and MRI images. c Allograft for repairing bone defect and 3D-printed osteotomy guide plate. d and e Anteroposterial and lateral X-ray were performed at 7 days and 18 months postoperatively, respectively. The results showed that the host–donor junction of the metaphysis had achieved bone healing, but the junction at the diaphysis had nonunion, and there was no sign of loosening of internal fixation