This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
Best treatment of old fracture is 
Select and explain. 
A. Manipulation and POP cast application., B. Open reduction and internal fixation and bone grafting., C. K Wire fixation, D. External fixation
B: Open reduction and internal fixation and bone grafting.
Answer: B: Open reduction and internal fixation and bone grafting. 
Explanation: Nonunion fracture shaft femur requires open reduction and rigid internal fixation with either intramedullary nail or DC plating and bone grafting.