Dislocated shoulder
（重定向自Dislocation of shoulder joint）
![](/Images/godic/202501/09/Gray3263315.png")
![An anterior dislocation of the shoulder](/Images/godic/202501/09/Luxation_epaule3315.PNG")
![Lightbulb sign indicative of posterior shoulder dislocation shown on the left. On the right, the same shoulder after reduction.](/Images/godic/202501/09/Lightbulb_sign_-_posterior_shoulder_dislocation_-_Roe_vor_und_nach_Reposition_0013315.jpg")
![An inferior dislocation of the shoulder after an automobile accident. Note how the humerus is abducted. Also present is a fracture of the greater tuberosity.](/Images/godic/202501/09/Inferiourdislocation3315.JPG")
A dislocated shoulder occurs when the humerus separates from the scapula at the glenohumeral joint. The shoulder joint has the greatest range of motion of any joint in the body and as a result is particularly susceptible to subluxation and dislocation. Approximately half of major joint dislocations seen in emergency departments involve the shoulder. Partial dislocation of the shoulder is referred to as subluxation.