1. Pain and swelling When a joint dislocation is caused by an external force (often combined with a fracture), the patient first feels severe pain in the joint area, accompanied by swelling. This is because the dislocation of the joint inevitably causes damage and injury to the soft tissues around the joint, causing bleeding and edema in the soft tissues, resulting in local pain and swelling. 2.Joint dysfunction The normal function of the joint depends entirely on the normal alignment between the joint surfaces. When the joint is dislocated, the joint surfaces leave each other and their synergy does not exist, so the joint cannot move and the joint function is lost. At this time, the patient feels that the joint is in some kind of “intermediate” state, neither flexing nor straightening. 3, the joint part is obviously deformed due to the abnormal displacement of the bones that make up the joint, so that the shape of the joint appears obviously changed. From the appearance, the joint shape is obviously abnormal, and the limb appears abnormally shortened or lengthened. The dislocated joint can be felt at the end of the displaced bone. 4. Elastic fixation phenomenon After joint dislocation, the limb is kept in an abnormal position due to the action of the joint capsule, ligaments and muscles. When the limb is moved passively, the joint is “stuck” and resistance is felt, which is called elastic fixation phenomenon. After joint dislocation, there is an obvious feeling of emptiness in the area where the original joint is located, which can be touched on the body surface. 6.X-ray performance X-ray examination is the main method to confirm the diagnosis of joint dislocation, for suspected joint dislocation, X-ray films should be taken routinely to confirm the diagnosis. The direction of dislocation? Whether it is accompanied by fracture, etc. It can provide reference for treatment.