Which test is performed with thumbs up to minimize impingement when testing supraspinatus strength?

Which test is performed with thumbs up to minimize impingement when testing supraspinatus strength?

• A. Empty can test.
• B. Drop arm test.
• C. Full can test.
• D. Painful arc test.

Answer: (C)

The test uses a thumbs-up position to reduce impingement while assessing supraspinatus strength. When the arm is in the scapular plane with the thumb pointing upward (the full can position) and you apply resistance, the supraspinatus is tested in a way that minimizes contact with the acromial arch. This setup keeps the subacromial space more open and isolates the supraspinatus, so weakness or pain more accurately indicates supraspinatus pathology. In this position, you’re less likely to get impingement that would masquerade as weakness, which is a risk with the other commonly used position (thumbs down) that increases impingement and can confound the test. The other tests serve different purposes: some detect tears, others identify general impingement pain during mid-range movement, but they don’t isolate supraspinatus strength the way the full can does.

The test uses a thumbs-up position to reduce impingement while assessing supraspinatus strength. When the arm is in the scapular plane with the thumb pointing upward (the full can position) and you apply resistance, the supraspinatus is tested in a way that minimizes contact with the acromial arch. This setup keeps the subacromial space more open and isolates the supraspinatus, so weakness or pain more accurately indicates supraspinatus pathology.

In this position, you’re less likely to get impingement that would masquerade as weakness, which is a risk with the other commonly used position (thumbs down) that increases impingement and can confound the test. The other tests serve different purposes: some detect tears, others identify general impingement pain during mid-range movement, but they don’t isolate supraspinatus strength the way the full can does.