Sequelae and postoperative complications of spinal stenosis surgery are mostly seen in nerve injury, bleeding and infection. 1. Nerve injury: because when decompression is done in spinal stenosis surgery, the pathological structures that squeeze the nerve are removed around the nerve, and these structures and the nerve tend to stick together, it is very likely that the nerve will be injured during the surgery, and the symptoms of nerve injury will appear, including sensory disorders, urinary and fecal disorders, impaired limb movement, muscular atrophy, and pain caused by the nerve injury. 2. Bleeding: due to bleeding from the wound during the surgery, it is easy to cause intra-vertebral hematoma after the surgery, which may cause changes in the muscle strength of the lower limbs. 3. Infection: There is also a risk of incision infection after surgery due to open surgery and the implantation of foreign bodies such as internal fixation. Other complications may occur after spinal stenosis surgery, such as deep vein thrombosis of the lower extremities. However, due to the rapid development of science and technology, minimally invasive techniques and the use of microscopes, lumbar spinal stenosis surgery is now a very mature surgery, which can effectively avoid the occurrence of many complications, and it is recommended that the patient actively seek medical treatment, and actively take targeted treatment according to the condition.