Resection of distal femur and endoprosthetic reconstruction in 36-year-old woman with osteosarcoma. A and B, Anteroposterior and lateral radiographs show osteosarcoma of distal femur. C, Plane between femoral vessels (arrows) and tumor is developed. D, Osteotomy performed with oscillating saw. E, Curet used to obtain specimen for frozen section to check marrow margin. F, Distal femur resected. G, Resected specimen and prosthesis. H, Prosthesis cemented into femur and tibia.