3.1 Improper mastery of initial surgical indications The lumbar and leg pain of the elderly is often caused by multi-factorial pathological changes. At the same time as spinal canal stenosis, osteoporosis, lumbar spondylolisthesis, peripheral neuropathy, and lumbar muscle strain may occur. Before the first operation, a careful medical examination combined with the necessary imaging and neuroelectrophysiological examinations will comprehensively analyze the cause of the patient's low back and leg pain and carefully identify related diseases. In this group, 2 women over the age of 60 suffered from osteoporosis for many years. After spinal canal decompression, they had been suffering from low back pain. Their movements were significantly restricted, and their lower back and lower limbs were weak. After waist circumference protection and anti-osteoporosis treatment, symptoms improved. 3.2 Improper operation timing Spinal stenosis causes the pressure of the nerve and blood supply in the spinal canal to increase, which may lead to ischemia of the cauda equina nerve and subsequent demyelination changes, resulting in persistent pain. Once irreversible nerve damage occurs, the improvement of postoperative symptoms is often unsatisfactory. Fifteen patients in this group still had limb numbness after spinal canal decompression, and 3 patients had partial bladder and rectum dysfunction, and the neurotrophic drug treatment effect was not satisfactory. 3.3 Lumbar spine instability For degenerative lesions, lumbar spinal stenosis and lumbar spine instability often coexist, so the patient's spinal stability must be evaluated before the initial surgery. For patients who have had instability or spondylolisthesis before surgery, not only to fully decompress, but also to restore the stability of the lumbar spine. Extensive resection of the posterior structure, especially excessive excision of the facet joints, can lead to spinal instability, and internal fixation fusion is particularly necessary to prevent iatrogenic instability. 3.4 Incomplete decompression of spinal canal stenosis caused severe compression of nerve roots and cauda equina nerves in the spinal canal. Factors of compression may include lamina thickening, articular process hyperplasia, hypertrophy of the ligamentum flavum, intervertebral disc herniation, and posterior bone Many factors, such as hyperplasia and intervertebral foramen stenosis, coexist, so thorough decompression is the key to treatment. Inadequate decompression of the lateral recess and intervertebral foramen is an important reason for the postoperative nerve root compression symptoms | 1. 3.5. Adhesion of scars in the spinal canal The group of 6 patients had symptoms that gradually eased after the initial angle relief after the first operation. Symptoms of root pain appear. During the operation, laminar new bone formation was found in the spinal canal, there was serious adhesion of scar tissue around the nerve root and the dural sac, the activity of the nerve root was significantly reduced, and it was easily pulled to produce root pain. Post-operative adhesion is generally inevitable, and we take some measures to reduce the occurrence of adhesion. Our experience is: ①gentle operation during operation to avoid excessive damage to surrounding normal tissues; ② complete hemostasis with bipolar electrocoagulation before closing the incision; ③ rinse the incision with a large amount of normal saline to remove tissue debris and blood clots, Both can reduce adhesions and reduce the risk of infection; ④ covering the dura sac and nerve roots with sodium hyaluronate can effectively reduce adhesions | 2 |; ⑤ incision drainage; ⑥ cross-kick exercise on the bed after operation can make the nerve roots Continuously slide to form an active channel to avoid serious adhesion. 3.6 Myogenic pain in the lumbar and back patients with degenerative lumbar spinal stenosis may have a certain degree of muscle strain on the lumbar and back, and the operation of the operation has increased the metabolic disorder of the ligaments of the muscles. The patient has a long history of bed rest after the operation. If there is no effective exercise for the lower back muscles, the patient often has recurrent chronic low back pain. Postoperative functional exercise of the lower back muscles should be regarded as an effective method of prevention and treatment. Elevator Components, Cabin Operation Panel for Elevators,Elevator Parts Components Ningbo Xinda Elevator Traction Technology Co., Ltd. , https://www.xinda-elevator.com