孙扬　牛晓辉　王涛　张清　丁易　郝林

The clinical manifestations, diagnosis and treatment, postoperative follow-up of a 11-year-old female patient with osteosarcoma in the right distal femur were reported. The related research articles at home and abroad were reviewed. The patient underwent distraction osteogenesis for reconstruction following osteosarcoma resection in the right distal femur, and an intramedullary nail was used to maintain the stability during the distraction. The patient was followed up for 112 months. The length was extended by 11cm. The duration of external fixation was 29 months. No local recurrence or lung metastases appeared. Neither wound infection nor pin tract infection was found postoperatively. Neither axial deviation nor re-fracture occurred in the extended femoral segments. The final Musculoskeletal Tumor Society ( MSTS ) score was 90%.