Fifth, ankylosing spondylitis. This disease is common among young men and is hereditary. It mainly involves the spine, axial bones and major joints of limbs, and is characterized by fibrosis, ossification and rigidity of intervertebral discs and nearby tissues. The disease develops slowly, and early diagnosis is difficult, but early diagnosis and treatment can obviously reduce the disability rate. Patients with low back pain may be accompanied by chest back pain, neck stiffness, joint swelling, lower limb pain and so on. After a long rest, the affected part has a sense of stiffness, which is relieved or disappeared after the activity. Sixth, aseptic avascular necrosis of femoral head. The early symptoms are pain in the front, lateral and buttocks of hip joint, which is aggravated after exercise, but the waist symptoms are not obvious, and the tenderness and knocking pain of hip joint are obvious. Passive exercise of hip joint can cause pain. Seventh, lumbar spondylolisthesis with spinal stenosis. This is also one of the common causes of low back and leg pain. Symptoms are very similar to lumbar disc herniation. Eighth, lumbar spinal stenosis. The disease is more common in the elderly, with slow onset, long-term low back pain and leg pain, which are aggravated when standing and walking, and relieved when squatting.