There is a special sign for shoulder dislocation called Dugas sign, also called Dugas sign in Chinese, which is also called shoulder hitch test. It means that after using the affected limb, such as the right shoulder dislocation, the elbow joint of the right hand presses against the chest wall and the right hand cannot reach the left shoulder. Another way is to use the right hand to latch onto the opposite shoulder, and the right elbow joint cannot press against the chest wall, which is called a positive Duggar’s sign. Duggar’s sign is a very specific sign, and if it is positive, it suggests shoulder dislocation. The Duggar’s sign can also determine whether the shoulder dislocation has been successfully repositioned. If it has been successfully repositioned, the elbow joint on the affected side can press against the chest wall while the hand can rest on the opposite shoulder. If the shoulder joint is dislocated, the humeral head goes outside and the joint pelvis is empty. When you touch the shoulder joint, you will find that the affected side is different from the healthy side. In appearance, the shoulder is not so rounded and is a square shape, also called square shoulder deformity. Sometimes you can feel the humeral head to see if the shoulder joint is dislocated, for example, if it is dislocated downward, you can touch the dislocated humeral head in the axilla or under the rostral process or under the clavicle. The local symptoms of shoulder dislocation are pain and swelling in the shoulder, square shoulder deformity, and also shoulder joint movement disorder, which makes the patient afraid to move, and the pain will be aggravated when the shoulder is stressed. During the examination, we can see that the deltoid muscle, which is round and full, has turned into a square shoulder deformity and the distance from the shoulder peak to the humerus has increased.