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: Surgery
In patients with osteoahritis of knee joint, atrophy occurs most commonly in which muscle : 
Select and explain. 
A. >Qudriceps only, B. >Hamstrings only, C. >Both (a) and (b), D. >Gastrocnemius
A: >Qudriceps only
Answer: A: >Qudriceps only 
Explanation: Quadriceps only Met Maheshwari 3/e, p 253;Apley's 8/e, p 472] In osteoahritis of knee joint, the quadriceps muscle is usually wasted.