This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Elbow injuries, Subject name: Orthopaedics
Dawbarn sign is seen in 
Select and explain. 
A. Infraspinatus tendinitis, B. Subacromial bursitis, C. Achlilles tendon injury, D. rotator cuff tear
B: Subacromial bursitis
Answer: B: Subacromial bursitis 
Explanation: In SUBACROMIAL BURSITIS, pressure over the deltoid below the acromion with the arm hanging by side causes pain. However when the arm is abducted,pressure ovehe same point causes no pain because bursa disappears under acromion. This disappearnce of pain is called &;DAWBARN SIGN&;,very useful test to determine subacromial bursitis. Ref: maheswari 9th ed