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: Unknown
For a distended knee joint which of the following position is most comfortable ? 
Select and explain. 
A. Full extension, B. 30° flexion, C. 60° flexion, D. 90° flexion
B: 30° flexion
Answer: B: 30° flexion 
Explanation: In 30° flexion, knee joint has maximum capacity and pressure of contained fluid or blood is minimum and consequently there is least pain. Capacity of knee joint decreases and pain thereby increases when the knee is fully extended or flexed more than 30°-45°.