This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fracture Distal Femur, Subject name: Orthopaedics
Injury to popliteal artery in fracture lower end of femur can be caused by - 
Select and explain. 
A. Proximal fragment, B. Muscle haematoma, C. Distal fragment, D. Tissue swelling
C: Distal fragment
Answer: C: Distal fragment 
Explanation: Ans. is 'C' i.e., Distal fragment o In distal third shaft fracture or supracondylar femur fracture, the distal fragment is tilted backward due to strong gastrocnemius pull. o This posteriorly tilted distal fragment can cause popliteal artery injury.