1.There are two reasons for hair loss caused by traditional large incision via scalp debridement surgery: (1) Hair follicle damage (permanent hair loss) The incision direction is inconsistent with the hair follicle growth direction when cutting the scalp, resulting in transverse hair follicle damage; the incision direction is inconsistent with the hair follicle direction when removing the scalp resulting in new hair follicle damage. Therefore, the width of follicular damage at both ends of the incision determines the width of scalp hair loss after surgery. Therefore, if there is no follicular damage at either end of the incision, there will be no significant hair loss around the incision; follicular damage on one side of the incision will result in hair loss on one side of the incision, while follicular damage on both sides of the incision will result in a wider area of hair loss on both sides of the incision. This kind of hair loss is permanent and requires fine re-restoration of the incision, removal of the follicle-free area and preservation of hair follicles (simpler), or localized hair transplantation (more complicated). (2) is the scalp nutritional state (temporary hair loss) Scalp excision too much tension in the suture will affect the blood circulation of the scalp, causing scalp hair loss, but this kind of hair loss will gradually improve; second, the use of scalp clamps for a long time during surgery to prevent scalp bleeding, without removing the scalp will also appear local scalp ischemic hair loss, which can usually recover in about 3 months. 2, minimally invasive endoscopic debridement surgery will not cause significant hair loss and long-term hair loss minimally invasive endoscopic surgery in the scalp incision is very small (1cm and 2cm), it is easy to control the incision does not damage the hair follicles, and do not have to remove the scalp to achieve lifting, hair will not be reduced. However, some patients (about 1%) may experience a small amount of hair loss for a short period of time after the surgery. It is possible that the nutritional status of the scalp is affected for a short period of time after the surgery, and the scalp recovers 3 months after the surgery and eventually there is no worry of hair loss.