The Jobe Empty Can Test is a physical examination maneuver used to assess the shoulder. It helps identify potential issues, particularly involving a specific rotator cuff muscle. This test serves as a preliminary assessment tool for shoulder discomfort, weakness, or limited motion. It is a common part of the initial evaluation of shoulder concerns.
Performing the Empty Can Test
The Jobe Empty Can Test begins with the individual standing or sitting. The examiner guides the arm into a specific position. The arm is raised to 90 degrees of abduction and moved forward by 30 to 45 degrees, placing it in the scapular plane. The arm is then internally rotated so the thumb points downward, mimicking the action of emptying a can.
Once the arm is in this “empty can” position, the examiner applies downward pressure. The individual is asked to resist this force. The test is often performed on both arms for comparison. Observing any pain or inability to maintain the position against resistance is important.
Interpreting the Findings
A positive result on the Jobe Empty Can Test occurs if pain or weakness is experienced in the shoulder when resistance is applied. This suggests potential involvement of the supraspinatus muscle or its tendon. The supraspinatus is a rotator cuff muscle that stabilizes the shoulder joint. Pain may indicate an inflamed tendon, while significant weakness can point towards a tear.
The specific positioning of the arm during the test isolates the supraspinatus muscle’s activity. This helps determine if this muscle is the source of discomfort or weakness. A negative result means no pain or weakness when downward pressure is applied, suggesting supraspinatus pathology is less likely. However, other shoulder conditions might still be present even with a negative result.
When to Seek Professional Advice
The Jobe Empty Can Test provides initial insights but is not a standalone diagnostic tool. Further medical evaluation is necessary to establish a definitive diagnosis. Consult a healthcare professional if a positive result is observed, or if persistent shoulder discomfort, weakness, or limited range of motion occurs. Ongoing pain, especially with weakness or functional limitation, requires medical attention.
A healthcare provider can conduct a comprehensive physical examination. This may involve additional specialized tests to understand the shoulder’s condition. Diagnostic imaging, such as an MRI, may be recommended to confirm a diagnosis and determine injury extent. These steps help develop an appropriate treatment plan.