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
In fracture of femur popliteal artery is commonly damaged by - 
Select and explain. 
A. Proximal fragment, B. Distal fragment, C. Muscle haematoma, D. Tissue swelling
B: Distal fragment
Answer: B: Distal fragment 
Explanation: In distal third shaft fracture or supracondylar femur fracture, the distal fragment is tilted backwards due to strong gastrocnemius pull.
This posteriorly tilted distal fragment can cause popliteal artery injury.