The empty can test is a physical examination technique commonly used in the assessment of shoulder injuries, specifically to test for supraspinatus muscle weakness or injury.If the patient experiences pain or weakness during the second part of the test when the arm is in the empty can position, it may suggest a tear or injury to the supraspinatus muscle. This test can help the physiotherapist to identify potential issues with the rotator cuff or other structures in the shoulder joint. | Physiome