What are the complications of orthognathic surgery? Are there any after-effects? What are the complications of orthognathic surgery? The biggest complication of orthognathic surgery is postoperative airway obstruction due to swelling, but it can be done in an experienced hospital and can be overcome very smoothly. Other serious complications include necrosis of bone segments, accidental fractures, nerve damage, etc. These complications are related to the surgeon’s skill and experience, and generally an experienced surgeon can avoid such complications very well. Are there any sequelae after orthognathic surgery? The most common sequelae are post-operative lower lip woodiness and hypesthesia, which are mostly caused by the pulling of the inferior alveolar nerve during surgery. 95% of patients can fully recover about six months after surgery, and only 5% of patients have incomplete recovery of skin sensation, which has no effect on facial motor function. Other sequelae may be temporomandibular joint problems, orthognathic patients are mostly accompanied by joint symptoms before surgery, such as joint popping, pain, strangulation and other symptoms, most patients can be relieved or recovered after surgery, but there are also some patients whose joint symptoms have not improved or have worsened after surgery, which is due to the change in the position of the jaw bone after orthognathic surgery, and the joint needs to adapt to the new position and gradually undergo alteration. It is understandable that there is some mild discomfort and pain in the joint during the process of alteration and adaptation, and the symptoms may be reduced with the extension of time.