Rotator cuff tear diagnosis involves a combination of shoulder assessment tests, movement testing, and symptom evaluation to identify damage to the rotator cuff muscles or tendons.
Because many shoulder injuries cause similar symptoms, an accurate diagnosis is important before starting treatment or rehabilitation. Here, we explain the clinical tests and assessment methods commonly used to diagnose a rotator cuff tear or rotator cuff strain.
Common rotator cuff tear symptoms
Symptoms of a rotator cuff tear or strain may include:
- Sudden shoulder pain ranging from mild to severe
- A tearing sensation within the shoulder
- Pain that radiates down the upper arm
- A snapping or popping sensation at the time of injury
- Difficulty sleeping on the affected shoulder
- Pain during overhead movement
- Weakness when lifting or rotating the arm
- Signs of shoulder impingement during shoulder movement
Mild rotator cuff injuries may allow continued activity initially. However, symptoms often worsen over time without treatment. Pain and weakness may gradually increase, making it difficult to lift the arm away from the body.
Pain often increases with shoulder movement, particularly during lifting, reaching, or stretching movements. Loss of strength and shoulder function is also common.
The injured area may feel tender to touch, and swelling or muscle spasm can develop around the shoulder joint. In more severe tears, visible muscle deformity may occur.
When should I see a doctor?
- Shoulder pain that does not improve after 2–3 days
- Pain severe enough to stop you from working or carrying out daily activities
- Difficulty lifting your arm or reaching out to the side after a few days
- Inability to move your shoulder or arm at all
Rotator cuff diagnosis & assessment tests
Several shoulder injuries can cause similar symptoms. To diagnose a rotator cuff injury, clinicians use specific shoulder assessment tests to isolate the rotator cuff muscles and reproduce symptoms.
Empty can test
The empty can test helps assess the supraspinatus tendon, one of the most commonly injured rotator cuff tendons.
During the test:
- Raise your arm to approximately 45° in front of your body
- Turn your thumb downwards, as if emptying a can
- The clinician applies downward resistance as you lift your arm
Positive test result
Pain, weakness, or reduced control may indicate a supraspinatus tendon injury or rotator cuff tear.
Drop Arm Test (Codman’s Test)
The drop arm test assesses shoulder control and helps identify larger rotator cuff tears.
During the test:
- The clinician lifts your arm above your head
- You are then asked to slowly lower the arm
Positive test result
Inability to control the movement or sudden dropping of the arm may indicate a rotator cuff tear, particularly involving the supraspinatus tendon.
Abrasion Sign
The abrasion sign helps assess irritation or degeneration within the shoulder joint.
During the test:
- Raise your arm out to the side with the elbow bent
- Rotate the shoulder forward and backwards
Positive test result
A grinding or crunching sensation (crepitus) may indicate inflammation or degenerative changes within the shoulder joint.
Neer’s Sign
The clinician raises your arm with the thumb pointing down at approximately 45° in front of the body, then lifts it overhead. Pain during this movement may indicate shoulder impingement, often involving the supraspinatus tendon.
Hawkins-Kennedy Test
The arm is raised to 90° in front of the body with the elbow bent. The clinician then rotates the shoulder inwards. Pain during this movement may indicate shoulder impingement involving the supraspinatus tendon.
Which rotator cuff test is most accurate?
No single clinical test can diagnose a rotator cuff tear with complete accuracy. Clinicians usually combine several assessment tests with your symptoms, injury history, and shoulder examination findings to reach a diagnosis.
The empty can test, Hawkins-Kennedy test, and Neer’s sign are commonly combined to assess the supraspinatus tendon and identify shoulder impingement. Ultrasound or MRI scans may be required to confirm the extent of the injury.
Rotator cuff strain vs tear
It is not always easy to tell the difference between a rotator cuff strain and a tear based on symptoms alone.
A strain is a milder injury involving overstretching or small micro-tears within the muscle or tendon. Pain is usually manageable, and you may still be able to move your arm, although movement is often uncomfortable.
A tear is a more severe injury and may be partial or complete. Symptoms commonly include significant weakness, difficulty lifting the arm, and reduced control of shoulder movement. In more severe cases, you may be unable to lift your arm at all.
Because symptoms can overlap, clinical assessment and imaging are often required to confirm the diagnosis and guide treatment.
Early diagnosis is important so appropriate treatment can begin as soon as possible. Read more about our rotator cuff rehabilitation program and rotator cuff exercises to support your recovery.
Do I need a scan?
In many cases, a rotator cuff injury can be diagnosed through a clinical assessment and specific shoulder tests. However, imaging may be required if the diagnosis is unclear or symptoms are severe.
Ultrasound scans are commonly used to assess tendon damage, while MRI scans provide more detailed information about the muscles, tendons, and surrounding structures. Imaging can help confirm whether the injury is a strain, partial tear, or complete tear.
Scans are more likely to be recommended if you have significant weakness, persistent pain that does not improve, or if surgery is being considered.
