What is one of the primary symptoms of Subacromial Impingement Syndrome according to the diagnostic cluster?

• A. Pain with external rotation MMT
• B. Limited internal rotation
• C. Swelling around the shoulder
• D. Tenderness on palpation

Answer: (A)

One of the primary symptoms of Subacromial Impingement Syndrome identified in the diagnostic cluster is pain with external rotation manual muscle testing (MMT). This symptom is significant because the condition is characterized by irritation of the rotator cuff tendons and the subacromial bursa during overhead activities or when the arm is placed in certain positions. When performing external rotation, especially against resistance, individuals with this syndrome will typically experience pain due to the mechanical compression of the structures within the subacromial space. This finding helps differentiate subacromial impingement from other shoulder pathologies that may present with different patterns of discomfort or functional limitations.

The other options might display characteristic signs or symptoms related to shoulder conditions, but they are not as specifically associated with the diagnostic criteria for Subacromial Impingement Syndrome. For example, limited internal rotation is generally more indicative of glenohumeral joint issues rather than impingement. Swelling around the shoulder could be a general sign of inflammation but is not specific enough to indicate impingement. Tenderness on palpation may certainly be present with various shoulder disorders, yet it doesn't pinpoint impingement syndrome as clearly as pain during external rotation does. Hence, recognizing pain with external