You’re evaluating a patient with shoulder pain who reports weakness when reaching overhead to grab a coffee mug from a high shelf. You suspect rotator cuff involvement, but which test will help you zero in on the supraspinatus? That’s where the Empty Can Test (Jobe’s Test) becomes your go-to clinical tool.
What is Empty Can Test (Jobe’s Test)?
The Empty Can Test, also called Jobe’s Test, is a special orthopedic test used to assess the integrity and strength of the supraspinatus muscle and tendon. The patient positions both arms in 90° of shoulder abduction in the scapular plane, with full internal rotation (thumbs pointing down, as if emptying a can). The examiner applies downward pressure while the patient resists. A positive test reproduces pain or significant weakness.
Why Empty Can Test Matters in Physical Therapy Practice
This test matters because it helps distinguish supraspinatus pathology (e.g., tendinopathy, tear, or impingement) from other causes of shoulder pain like subacromial bursitis or cervical referral. The position maximizes the supraspinatus’s mechanical disadvantage, making it sensitive for detecting early weakness. For your Plan of Care (POC), a positive result directs you toward rotator cuff strengthening, activity modification, and unloading strategies—while alerting you to consider imaging if a full-thickness tear is suspected.
What You’ll See in the Clinic
Your patient will typically report lateral shoulder pain with overhead reaching or lifting. On exam, they may demonstrate pain at 70–100° of abduction or difficulty maintaining the test position against resistance.
“During shoulder eval, Empty Can Test was positive on the right, reproducing 6/10 pain in the lateral deltoid area and causing visible weakness (3/5) compared to the left side. Scapulohumeral rhythm was also disrupted during elevation. Patient reports difficulty with lifting grocery bags and throwing. I will begin a progressive rotator cuff strengthening program focusing on the supraspinatus and pain-free range of motion.”
Common Pitfall & Pro Tip
⚠️ Pitfall: Testing in the coronal plane (full abduction, not scapular plane) can overstress the subacromial structures, leading to a false positive. Ensure the arm is 30° forward from the coronal plane.
💡 Pro Tip: Compare the affected side to the uninvolved side. Also, use the Full Can Test as an alternative if the Empty Can position provokes excessive pain—it’s less irritating but still activates the supraspinatus. Teach the patient to “pour out the can” as a cue.
Memory Aid for Empty Can Test
Think “Thumbs down, pouring out”: When your thumb is down, the supraspinatus is “down and out” — at a mechanical disadvantage. If it’s weak, it will “cry for help” (pain and drop). This position mimics the exact way you’d empty a soda can, hence the name.
NPTE Connection
Expect to see the Empty Can Test in NPTE items asking you to identify the specific rotator cuff muscle being tested or to differentiate between supraspinatus weakness and other shoulder pathologies like a SLAP tear or subacromial impingement.
Related Physical Therapy Concepts
This test pairs well with Neer’s Impingement Sign and Hawkins-Kennedy Test for a complete rotator cuff assessment. It also connects to Scapular Dysfunction—if the scapula doesn’t upwardly rotate, the test is less valid. Post-surgically, you’ll monitor supraspinatus activation after Rotator Cuff Repair, progressing from isometrics to full-can exercises.
Quick Reference
✓ Positive test criteria: Pain, weakness, or dropping of the arm with resisted downward pressure ✓ Priority level: High – Helps differentiate rotator cuff pathology ✓ PT Interventions/Considerations: • Strengthen supraspinatus (submaximal pain-free progressive resistance) • Correct scapular upward rotation during elevation • Activity modification to avoid overhead aggravations • Consider imaging referral if pain is severe or strength loss is profound
Bottom line: The Empty Can Test is a quick, powerful screen for supraspinatus integrity—use it wisely to guide your shoulder rehab course.