Sciatica is a syndrome in which the pain is mainly in the sciatic nerve pathway and distribution area. The majority of cases of sciatica are secondary to the stimulation and compression of the sciatic nerve by lesions of the local sciatic nerve and surrounding structures, called secondary sciatica; a few are primary, i.e. sciatica. Lumbar spondylolisthesis is one of the common causes of sciatica, which usually refers to the forward or backward displacement of a vertebral body, most commonly in lumbar 4 and 5, followed by sacral 1. As a result of the compression or stimulation of nerve endings by lumbar spondylolisthesis, sciatica is reflexively caused. The age of the disease is mostly around 60 years old, with women being the majority. 1, lumbar spine slippage causes sciatica (1) due to the forward movement of the vertebral body, the formation of a ladder at the posterior edge of the adjacent vertebral body, resulting in the misalignment of the joint position directly compressing the sciatic nerve. (2) Degenerative changes occur in the lumbar spine, the lumbar spinal space becomes narrow, the intervertebral spaces become unstable, the joints protrude and become hypertrophied, the joint capsule relaxes, and vertebral migration occurs. With excessive flexion and extension, a certain degree of migration or sliding backward gradually occurs, which in severe cases can lead to narrowing of the intervertebral foramen and compression of the nerve roots to produce sciatica. (3) When the isthmus is defective, the fibrous tissue proliferates, thus compressing or stimulating the nerve root, and the slippage also involves the nerve root, which produces the symptoms of sciatic nerve involvement. 2.What are the characteristics of sciatica caused by lumbar spondylolisthesis (1) At the beginning, you will feel lower back pain or leg pain, mostly intermittent dull pain. The general pain symptoms are not serious and will not affect daily life. The pain may be significantly reduced or disappear when resting in bed, but it cannot be completely relieved. (2) When diagnosed by local palpation, pressure pain can be found at the spinal eminence of the affected vertebrae, and a feeling of steps is formed locally. (3) Initially, the painful point is located in the thigh or buttock, radiating to the lumbosacral region and calf, limping or swaying from side to side when walking, and restricted bending activities. Lumbar spinal slippage is one of the common causes of sciatica. Lumbar spinal slippage usually refers to the forward or backward displacement of a vertebral body, the most common sites being lumbar 4 and lumbar 5, followed by sacral 1. (1) Radiating pain or numbness in the lower limbs, with the initial pain point located in the buttocks or posterior thigh, radiating to the lumbosacral region and calf, limping or swaying from side to side when walking, restricted bending activities, and skin in the corresponding innervation area of the lower limbs Numbness. If the slipped vertebra is more anteriorly displaced, numbness in the saddle area, incontinence, weakness or paralysis of certain muscles of the lower limbs, and incomplete paralysis may occur in severe cases. 2, radiographic features: lateral lumbar spine X-ray film can be seen between the upper and lower synapses from the posterior up to the front of the cleft. The typical sign of “a dog wearing a necklace” can be seen on the oblique film of true slippage. 3.Lumbosacral pain: At the beginning, lower back pain or leg pain occurs, mostly intermittent dull pain, which usually does not affect daily life. The pain is aggravated during weight bearing or overexertion, and the pain is reduced or disappeared after bed rest, but cannot be completely relieved. 4.Local pressure pain: local palpation examination can reveal that the affected vertebrae have pressure pain at the spinous process and local formation of step sensation. The lower lumbar segment shows increased anterior convexity, or protective ankylosis. Posterior extension restriction with lumbar pain is one of the characteristics of this disease.