If you’ve ever had a shoulder evaluation for pain or suspected rotator cuff damage, there’s a good chance your physical therapist performed the empty can test. It’s one of the most commonly used clinical tests for shoulder pathology, but its name and purpose are often unclear to patients. Here’s what it involves, what a positive result actually means, and how PTs use it in context.

What Is the Empty Can Test?

The empty can test — also called the Supraspinatus Test or Jobe Test — is a clinical screen for supraspinatus muscle and tendon pathology. The supraspinatus is the most commonly injured of the four rotator cuff muscles, making this test particularly relevant for anyone with shoulder pain or limited overhead function.

The name comes from the arm position used: the arm is positioned as if you’re holding a can tilted forward to empty it — thumb pointing downward, arm raised to 90° of abduction and angled 30° forward in the plane of the scapula. This position places maximal demand on the supraspinatus tendon while minimizing the contribution of other shoulder muscles, making it relatively specific to supraspinatus function when weakness or pain is provoked.

How Is the Empty Can Test Performed?

The patient raises their arm to 90° of abduction in the scapular plane — approximately 30° forward of the frontal plane — with full internal rotation so the thumb points toward the floor. The physical therapist applies a downward resistance force as the patient attempts to maintain the arm position. A positive test is recorded when the patient experiences pain, weakness, or an inability to maintain the position against resistance.

Many clinicians now prefer the Full Can Test as a companion or alternative. In the full can version, the same arm position is used but with external rotation — thumb pointing upward. The full can test produces equivalent sensitivity for detecting supraspinatus pathology but is generally less painful to perform, which matters when the shoulder is significantly irritable. Most thorough shoulder evaluations include both to compare findings.

What Does a Positive Empty Can Test Mean?

A positive empty can test suggests supraspinatus pathology — which can include a partial or full-thickness rotator cuff tear, supraspinatus tendinopathy, or subacromial impingement. It’s essential to understand, however, that this test is a screen, not a diagnosis. The empty can test has moderate sensitivity (approximately 69%) and lower specificity, which means it catches many cases of supraspinatus pathology but also produces false positives. No single special test should be used in isolation to diagnose rotator cuff pathology.

In clinical practice, PTs use the empty can test as part of a cluster of shoulder tests. Common companions include the Neer impingement test (passive forward flexion with internal rotation), Hawkins-Kennedy (shoulder flexion to 90° with forced internal rotation), the drop arm test (passive lowering of the arm from 90° abduction), and Speed’s test for bicipital involvement. The clinical picture from multiple tests together is far more informative than any single test in isolation. Imaging confirmation — specifically MRI — remains the gold standard for diagnosing rotator cuff tears when the clinical picture warrants it.

Empty Can Test vs. Full Can Test: Which Is More Reliable?

Research comparing the two tests shows similar sensitivity and specificity for detecting supraspinatus pathology. The full can test (thumb-up position) is generally preferred by many clinicians today for a simple practical reason: it’s less painful. The internal rotation required for the empty can position creates more subacromial compression and impingement, which can make it unnecessarily provocative in an already irritable shoulder. The pain response can also confound the weakness finding — it becomes unclear whether the patient is failing because of true muscle weakness or because the position itself is too painful to tolerate.

That said, the empty can test remains widely taught and clinically useful. Many PTs perform both. The more important principle is that neither test stands alone — clinical judgment and multi-test clustering matter more than any single test’s sensitivity numbers.

What Happens After a Positive Empty Can Test?

After a positive empty can test, your PT will typically continue the shoulder assessment with additional special tests and a full range of motion and strength evaluation. If cervical involvement is suspected — particularly if you have any neck pain, radiating arm symptoms, or abnormal upper extremity reflexes — cervical spine testing will also be included. The Spurling test for cervical radiculopathy is a common add-on.

From there, the treatment direction depends on what the full clinical picture suggests. Supraspinatus tendinopathy typically responds well to conservative physical therapy: progressive tendon loading, scapular stability work, and rotator cuff strengthening in a structured program. Partial-thickness tears often follow a similar conservative path. For patients with a suspected full-thickness tear, particularly with significant weakness, your PT may recommend imaging and an orthopedic consultation to discuss whether surgical or conservative management is more appropriate for your specific situation.

Get a Complete Shoulder Assessment

Shoulder pain that’s limiting your reaching, lifting, or sleeping? A thorough clinical evaluation — not just one test — is how we figure out what’s actually going on. Highbar’s shoulder specialists use a comprehensive assessment to get you the right treatment. Book a shoulder evaluation today.

Dr. Bobby Dattilo PT, DPT, OCS is the Orthopedic Residency Director at Highbar Physical Therapy. His clinical focus includes shoulder pathology, post-surgical rehabilitation, and orthopedic residency education.