This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Trauma, Subject name: Surgery
An 81-year-old female falls and presents to the emergency department. What injury to this tissue or structure causes lower leg extremities to be externally rotated? 
Select and explain. 
A. Sacroiliac joint, B. Neck of femur, C. Lateral meniscus, D. Intertrochanteric
C: Lateral meniscus
Answer: C: Lateral meniscus 
Explanation: Both subcapital and intertrochanteric fractures present with external rotation of the lower extremity. The lateral rotators are attached to the bone distal to the fracture line to cause this typical clinical sign. Trochanteric fractures have a better prognosis because the blood supply to the proximal segment remains intact.