Painful Arc Test: how to locate the source of shoulder pain by range of motion

If you had to pick just one test to start understanding what range of motion your client's shoulder hurts in, the painful arc test would be a strong candidate. It's extremely simple (you just need the person to raise their arm), yet it gives you very valuable information about where to locate the problem, without needing any equipment.

What does this test measure?

The painful arc test assesses in which range of arm abduction pain appears, helping point toward which structure might be involved based on the moment in the movement when pain occurs.

Equipment needed

• None

Step-by-step protocol

1. The subject stands with the arm relaxed at their side
2. Ask them to raise the arm out to the side (abduction) all the way up, as actively and slowly as possible, and to tell you the exact moment pain appears
3. Note the range of degrees where pain appears, and whether it disappears or changes at any later point
4. Repeat the movement lowering the arm from overhead, to confirm whether the pain pattern repeats
5. Repeat on the other side for comparison

Common mistakes

• Not asking the subject to move slowly, which makes it hard to pinpoint the exact range where pain starts/ends
• Not distinguishing between pain that appears and stays, pain that appears and disappears (the classic "arc"), and pain that only appears at the end of the range
• Assuming any pain during abduction is "the same thing" without noting the specific range

How to interpret the result

Pain range	General interpretation
No pain throughout the range	Negative
Pain between roughly 60° and 120° of abduction, improving outside that range (the classic "arc")	Positive — suggests subacromial involvement (supraspinatus, subacromial bursa), since this is the range where the subacromial space narrows the most
Pain in the last degrees of elevation (close to 180°)	Suggests acromioclavicular joint involvement
Pain present from the start of the movement, with no clear "arc"	Suggests another cause (capsulitis, more generalized glenohumeral pathology); worth investigating further with other tests

The classic painful arc (pain between 60-120°) has a fairly consistent association with subacromial pathology in the literature, although like any orthopedic test, it's not 100% specific.

Related tests

The painful arc is an excellent starting point that points toward which tests to run next:

• If pain appears in the mid-range (60-120°), it makes sense to follow up with the Neer test and Jobe's test to confirm subacromial involvement
• If pain appears at the end of the range and is localized to the top of the shoulder, it makes sense to assess the AC joint with O'Brien's test

Why it matters to track this

Knowing exactly which range triggers pain not only helps guide diagnosis but also lets you design training more intelligently — for example, temporarily avoiding the painful range during lateral raises while working other angles that are pain-free. In Movalytics you can log the degree range where pain appears at each assessment, and track whether that range narrows (improvement) or widens (worsening) over time.

Frequently asked questions

Can the painful arc be measured precisely without a goniometer? A reasonable visual estimate is usually enough for routine clinical follow-up, but if you want more precision, a goniometer or an angle-measuring app can help you stay consistent between assessments. Is it normal for pain intensity to change within the same arc? Yes, it's common for pain to have a "peak" within the painful arc rather than being constant. Note both where it starts and where it's most intense if you can. Does a painful arc always indicate a rotator cuff problem? It's the most common cause of the classic painful arc (60-120°), but not the only one. That's why it's worth combining it with other tests before drawing conclusions.