Drop Arm Test: how to detect large rotator cuff tears

When someone tells you "my arm just drops" when trying to keep it raised, or describes a sudden, marked loss of shoulder strength (sometimes after exertion or a fall), the Drop Arm Test is one of the tests that can give you the most information in the least time. It's especially relevant in people over 40-50 with relatively recent-onset shoulder pain.

What does this test measure?

The Drop Arm Test assesses the ability to actively hold the arm raised against gravity, looking to detect large or massive rotator cuff tears (especially of the supraspinatus), where active control of the arm in abduction is clearly lost.

Equipment needed

• None

Step-by-step protocol

1. The subject stands
2. Passively raise the subject's arm to about 90° of abduction (or slightly above, up to the point where the person feels no pain)
3. Ask them to actively hold the arm in that position as you progressively let go
4. Watch whether the subject can hold the position or whether the arm "drops" suddenly and uncontrollably, usually with pain
5. If the arm drops, you can ask them to try to actively raise it again from a lower position to see how far they get

Common mistakes

• Letting go of the arm too abruptly, which can cause a "failure" from surprise rather than true weakness
• Not distinguishing between a sudden drop (more typical of a tear) and a slow, shaky descent (more typical of pain/inhibition without a full tear)
• Not first ruling out a passive range limitation (capsulitis) that could confuse the picture

How to interpret the result

Result	Interpretation
Holds the arm raised in a controlled manner	Negative
The arm drops suddenly and uncontrollably, with or without pain	Positive — suggests a large/massive rotator cuff tear (typically supraspinatus, possibly also infraspinatus)

The specificity of the Drop Arm Test for large cuff tears is relatively high, but its sensitivity is low: many partial or smaller tears don't produce a positive Drop Arm. So a negative result doesn't rule out rotator cuff pathology, especially if there's pain and weakness on other tests.

If the result is positive, it's advisable to refer for medical imaging (ultrasound or MRI) to confirm the size and location of the tear.

Related tests

The Drop Arm Test makes more sense when combined with:

• Jobe's test — to specifically assess supraspinatus strength in a more graded way
• Painful arc test — to see in what range of motion the pain and weakness appear

Why it matters to record this

A positive Drop Arm Test is a clear signal that medical referral should be prioritized before continuing with regular upper-body programming. With Movalytics you can log this finding along with the date and the rest of the assessment, so there's a record of when it appeared and you can track progress over time (for example, after surgery or conservative treatment).

Frequently asked questions

Does a positive Drop Arm Test mean surgery is needed? Not necessarily. The treatment decision (conservative or surgical) depends on many factors (age, tear size, functional demands) and should be made by a specialist after imaging. Why doesn't a negative result rule out a cuff tear? Because the test is only clearly positive for large or massive tears. Partial or small tears can present with pain and mild weakness without the arm dropping in an obvious way. Is it safe to perform if I suspect an acute tear? Yes, it doesn't carry significant added risk, but if there's a recent traumatic history (fall, direct blow), it's advisable to prioritize medical evaluation before continuing with further strength tests.