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
Tom Smith septic ahritis affects 
Select and explain. 
A. Hip of infants, B. Joint of children, C. Shoulder in children, D. Neck of infants
A: Hip of infants
Answer: A: Hip of infants 
Explanation: Septic ahritis of hip seen in infants. At this age, the head of the femur is cailaginous and is rapidly and completely destroyed by the pyogenic process. Onset is acute with rapid abscess formation, which may burst out or be incised and heals rapidly. Usually it is mistaken as a superficial infection and the child presents some time later with complaint of a limp without any pain. On examination- it is found that the child walks with an unstable gait. The affected leg is shoer and hip movements are increased in all directions. Telescopy test is positive On X Ray, one finds complete absence of the head and neck of femur