Lumbar 4-5 surgery does not usually affect the sacrum. Lumbar disc herniation patients with lumbar 4-5 herniation can be given surgical treatment when conservative treatment is ineffective, such as small incision discectomy, posterior nucleus pulposus removal, artificial nucleus pulposus replacement, artificial intervertebral disc replacement, endoscopic nucleus pulposus removal, anterior transperitoneal or extraperitoneal nucleus pulposus removal, lateral percutaneous nucleus pulposus removal. Lumbar disc herniation, especially lumbar 5 sacral 1 disc herniation can cause sacroiliac joint pain, lumbar spinal canal nerve trunk compression can appear sacroiliac joint area pain. The sacrum is not usually affected after lumbar spine surgery. After lumbar 4-5 surgery, rehabilitation training should be carried out under the guidance of the doctor to avoid causing adverse effects.