system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Treatment of choice for old non-united fracture of shaft of femur -
assistant
The correct answer is  Treatment options for femoral shaft non-union are : -


Intramedullar interlock nailing with bone grafting (preferred).
K-nail with bone grafting.
Plating with bone grafting.