Decubitus ulcers, also known as pressure sores, are ischemic necrosis of the skin and subcutaneous soft tissue that occurs when the skin is under prolonged local pressure. Bed sores are rare in normal people and are most often seen in people who are too intoxicated and confused to adjust their position on their own. In addition, the pain reflex of the skin can prevent bed sores from occurring in normal people before the skin becomes ischemic. However, for some special groups, such as elderly people who are bedridden for a long time after hemiplegia, or those who are bedridden for a long time after a fracture of the lower extremity, or those who are paraplegic after a traumatic injury and have sensory-motor impairment of the lower extremity, the pain reflexes of the skin can prevent the occurrence of bedsores. Because of abnormal skin sensation or motor impairment, they cannot protect themselves by adjusting their position to avoid prolonged pressure on the local skin, thus forming decubitus ulcers. Therefore, from the perspective of the mechanism of decubitus ulcer formation, home care for these patients is the key to preventing decubitus ulcers, and it is important to have someone take care of them and ensure that they can turn over in 2-4 hours to avoid prolonged local skin pressure. Decubitus ulcers are very likely to develop if the local skin is pressurized for more than 4 hours. Decubitus ulcers are found in the sacrococcygeal region, the greater trochanter, and the sciatic tuberosity, where they can be seen deep in the bone. Decubitus ulcers can be treated conservatively with a change of medication, but this often takes several months, and larger and deeper decubitus ulcers cannot be healed with a change of medication and must be healed surgically, thus greatly reducing the duration of the disease (about 2 weeks), with a surgical procedure called flap transfer. See the following diagram for details: Sacrococcygeal decubitus preoperatively Postoperatively Greater trochanteric decubitus composite Sacrococcygeal decubitus preoperatively Left Right Postoperatively Left Right Sciatic tuberosity decubitus preoperatively: Postoperatively It should be noted that even if the surgery is successful, proper postoperative home care is needed, otherwise there is a possibility of recurrence of the decubitus.