Objective: To improve the diagnosis of tired fracture of the distal segment of femur, and to avoid its misdiagnosis.
Method: Misdiagnosis of 5 patients with tired fracture of distal segment of the femur was reviewed.
Result: Five male patients, aged 18 to 23 years had the lesion for 3 to 6 weeks. They had long tough experience of sports. The lesion was considered at first as osteosarcoma by radiograph and biopsy. It was eventually diagnosed as tired fracture of distal segment of the femur. Symptoms were relieved or disappeared after proper treatment. Follow-up for 7 to 18 months showed good results.
Conclusion: The key to avoid misdiagnosis and mistreatment of the fracture is to know its causes, morphological features of fracture healing, and correct pathologic diagnosis.