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: Orthopaedics
The most common site of fracture neck of the femur that causes avascular necrosis is - 
Select and explain. 
A. Sub-capital, B. Intertrochanteric, C. Trans-cervical, D. Basal
A: Sub-capital
Answer: A: Sub-capital 
Explanation: "The more proximal the location of a femoral neck fracture, the more likely there is to be nonunion and/or AVN". — Musculoskeletal trauma

Thus non-union and AVN will be most common in subcapital fracture and least in basicervical fracture.