This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Shoulder and arm injuries, Subject name: Orthopaedics
Vascular sign of Narath is positive in which of the follwoing ? 
Select and explain. 
A. Posterior dislocation, B. Central dislocation, C. Anterior dislocation, D. Lateral dislocation
A: Posterior dislocation
Answer: A: Posterior dislocation 
Explanation: Vascular sign of Narath: Patient in supine Palpate femoral aery in femoral canal Positive in hip dislocation - not palpable In fracture neck of femur - feeble pulsation Ref: maheswari 9th ed ohopedics