When the hip and knee degenerate or are damaged to a certain degree, surgery becomes an unavoidable treatment. With changes in lifestyle habits, people often do not take care of their knee joints, resulting in a gradual decline in the age group of patients. In addition to worrying about the risks associated with surgery, occasionally younger patients ask, “Doctor, will this wound leave a scar?” In order to prevent the psychological impact of surgical scars, we recommend “cosmetic sutures”. So, does a cosmetic suture mean that it will not leave a scar? Of course not. Today we will talk about what cosmetic sutures are. What are cosmetic skin sutures? First of all, there is no such thing as a “cosmetic suture”. The doctor will use different materials and thickness of “sutures” according to the patient’s condition, and suturing is the most important purpose. Skin tension is the most important factor in scar growth. In general surgery, the wound is often closed by directly pulling the incision together, while cosmetic suturing technique is used to minimize the tension of the incision and achieve precise tissue alignment through the site and level of needle entry and exit, the route of the thread in the tissue, and the choice of suture material, which can reduce the scar formation after the wound heals to a certain extent. Will cosmetic sutures leave scars? Wound stitching is like a “broken mirror”, no matter how much it is repaired, it will definitely leave traces, the difference is whether the scar will be obvious or not. The formation of scars is related to the individual’s body type, injury, suturing technique, post-operative rehabilitation and other factors. What can be determined is that cosmetic suturing techniques can minimize the risk and extent of post-operative incisional scar growth. Must cosmetic suturing be done by a plastic surgeon? With the gradual increase of patients’ aesthetic awareness, more and more surgeons have started to pay attention to cosmetic suturing techniques, not only limited to plastic surgeons, but also our orthopedic department has been paying more and more attention to the clinical application of cosmetic suturing in recent years. Many experienced surgeons have their own methods of handling intraoperative wound sutures and preventing scar growth, etc. Patients are advised to consult their attending physicians in advance when seeking treatment.