Sulcus Sign - Inferior Glenohumeral Instability To test inferior glenohumeral stability place traction on the humerus with the arm at the patient's side If a gap greater than 1 cm appears between the humoral head and the undersurface of the acromion it is considered a positive sulcus sign with inferior instability. Video via @open_michigan #Sulcus #Sign #Inferior #Glenohumeral #Instability #Shoulder #PhysicalExam #clinical #video #sports #msk #orthopedics
