Kummell’s disease, also known as obsolete vertebral fracture bone discontinuity, was first reported by German physician Kummell in 1895. I. This disease is mostly seen in elderly people, and patients basically have the following characteristics: 1. there is a history of minor trauma that leads to low back and back pain; 2. after a period of time, the patient’s low back pain symptoms disappear and this painless symptom lasts for weeks or even months; 3. immediately afterwards, in the absence of any trauma, the patient has pain again in the same area, which gradually worsens, and a kyphotic deformity develops; 4. the patient Most of them have severe osteoporosis. Second, what is the cause of Kummell’s disease (old vertebral fracture bone discontinuity)? The pathogenesis of Kummell’s disease (old vertebral fracture bone discontinuity) is not yet completely clear, and the following two hypotheses have been developed: 1. Ischemic osteonecrosis of the vertebral body: minor trauma leads to microfracture of the trabeculae in the vertebral body, and the blood vessels that nourish the vertebral body are damaged, which leads to insufficient blood supply to the vertebral body, which in turn leads to ischemic necrosis of the trabeculae, and the vertebral body cannot repair itself, thus leading to collapse of the vertebral body. The anterior 1/3 of the vertebral body has less blood supply than the posterior 2/3, so Kummell’s disease (old vertebral fracture with bone discontinuity) mostly occurs in the anterior 1/3 of the vertebral body. the anterior vertebral body compression is obvious, which leads to the occurrence of the posterior convexity deformity. 2, the formation of vertebral pseudarthrosis: some scholars believe that the mechanism of Kummell disease is the fracture of the vertebral body after the fracture, the fracture end bone discontinuity and thus the formation of the vertebral body pseudarthrosis, resulting in the existence of dynamic activities of the fractured vertebral body, resulting in the occurrence of vertebral instability. The instability of the fracture leads to increased pain and the collapse of the vertebral body due to the body’s own gravity, resulting in a retroconvex deformity. Third, Kummell’s disease (old vertebral fracture bone discontinuity) imaging manifestations: X-ray, CT, MRI and other imaging examinations suggest that the fractured vertebral body in the vacuum fissure sign, fluid signs, power position or folding top position X-ray appears power instability, such as power position fissure sign is the specific manifestation of Kummell’s disease (the following figure). Fourth, the diagnosis of Kummell’s disease (old vertebral fracture bone discontinuity): Kummell’s disease lacks a specific diagnosis, the diagnosis of Kummell’s disease needs to be combined with the patient’s medical history, clinical manifestations and imaging examinations, if the patient has a history of minor trauma, and after a good automatic recovery, the patient reappears with pain in the same area with posterior convexity deformity for several weeks or months, combined with imaging examinations, if there is The presence of the vacuum fissure sign or effusion sign, and the presence of dynamic instability on power or folding apex x-ray suggest the presence of Kummell disease. V. Treatment of Kummell’s disease (old vertebral fracture bone discontinuity): Kummell’s disease usually does not require conservative treatment, either brace fixation or bed rest, usually does not achieve satisfactory results, and patients are usually elderly, long-term bed rest will lead to the development of various complications, so Kummell’s disease usually requires surgical treatment. Surgical treatment usually involves cement infusion, vertebroplasty (PVP), and, if the posterior convexity deformity is significant and compresses the posterior spinal cord or neural structures, internal fixation therapy may be considered.