Determine the topic of the question-answer pair. Question: "what is impingement of the shoulder?";  Answer: "Shoulder impingement syndrome, also called painful arc syndrome, supraspinatus syndrome, swimmer's shoulder, and thrower's shoulder, is a clinical syndrome which occurs when the tendons of the rotator cuff muscles become irritated and inflamed as they pass through the subacromial space, the passage beneath the acromion ."? Topic:

Impingement syndrome