Purpose of Jerk Test: To test if there is a posteroinferior instability of the glenohumeral joint, indicating a torn posterior or posteroinferior labrum. Patient position: Sitting with the affected arm supported on the patient’s lap over a pillow. Examiner position: Standing behind the patient, near the affected shoulder. Procedure: Stabilize the patient’s scapula using one hand and hold the patient’s elbow with another hand. Elevate the … Continue reading Jerk Test