Three physical tests used to identify a rotator cuff injury include the drop arm test, empty can test, and Neer test.  A more invasive test is known as the pain-relief test. In this, an orthopedic specialist injects lidocaine into the shoulder joint. If the shot relieves the pain, it is likely the rotator cuff.  Imaging tests to evaluate a rotator cuff include MRI, arthrogram, and ultrasound.