The bone in front of the ear is also called the temporomandibular joint, which is mainly composed of two bones: one is the mandibular head of the mandible, and the other is the mandibular fossa of the temporal bone and the articular tuberosity. The surface of the joint is covered with a layer of fibrocartilage, and the joint capsule in this area is relatively loose, so it is easy to dislocate clinically. There is a common disease called temporomandibular joint disorder syndrome in otolaryngology, which refers to the abnormal lesion of the joint bones in this area. The cause may be related to the patient’s mental factors, trauma or eating hard things frequently, and some patients have systemic diseases, such as rheumatoid arthritis, etc. may have a relationship.