Video 2.4. The Infraspinatus Test

The examiner performs the Infraspinatus Test on a patient with a rotator cuff tear. The patient is seated with the shoulders adducted and the elbow at 90 degrees of flexion. The examiner asks the patient to externally rotate their shoulder, while the examiner applies a medially directed force to the arm. A test is considered positive with pain or weakness with resisted external rotation. Here, the patient displays significant weakness of his left shoulder in external rotation, indicating a positive test result and deficit of the infraspinatus.