Sulcus Sign (Inferior Glenohumeral Instability) Purpose: To determine if there is a presence of inferior glenohumeral instability and/or laxity (1). Patient position: Standing or Sitting upright with back unsupported and with affected arm relaxed by the side. Examiner position: Standing beside the patient’s affected side. Procedure: Grasp the patient’s affected side arm, around the elbow (at the bicondylar axis of the humerus) and gently pull … Continue reading Sulcus Sign