Lack of financial support

In recent years, total endoscopic extraction of nucleus pulposus has been widely used in the treatment of lumbar disc herniation due to its advantages of less trauma, faster recovery and less cost. However, the residual nucleus pulposus may protrude again after extraction, and the stability of the operative segment decreases and the degeneration of the diseased segment accelerates. Therefore, while decompression of nerve root is completed under total endoscopic nucleus pulposus extraction, tissue engineering of nucleus pulposus is urgently needed to replace the lost part, repair the remaining nucleus pulposus, and enable the disc to be re-sealed and pressurized. Nucleus pulposus tissue engineering is mainly based on cell therapy, and the corresponding biological scaffolds are selected to transplant cells into the diseased area for treatment. However, the current nuclear tissue engineering has some shortcomings, such as limited seed cell source, difficult survival of seed cells, inflammatory rejection in the transplantation area, poor mechanical properties of biological scaffolds, poor degradation performance, and inability to produce biospecific reactions between materials and cells, which seriously restrict the clinical application of nuclear tissue engineering. Human umbilical cord mesenchymal stem cells (hUC-MSCs) are ideal seed cells for the treatment of lumbar disc herniation due to their wide availability, strong proliferation ability and good immune regulation. Therefore, in this project, hUC-MSCs are used for cell transplantation into the vertebral disc of diseased vertebrae. As the treatment method of this project is extremely minimally invasive, it is conducive to the widespread promotion of the technology.

In order to initially observe the safety and effectiveness of human umbilical cord mesenchymal stem cells (hUC-MSCs) transplantation in the treatment of lumbar disc degeneration, this project planned to include a single group of 20 patients with lumbar disc herniation, and adopt an open study design of non-random, self-controlled, single-dose group, and locally inject 2mL hUcMSCs into the lumbar disc of enrolled patients.

The patients were followed up 3, 6 and 12 months after injection to evaluate the safety of hUC-MSCs. Meanwhile, the improvement of patients' low back pain and quality of life were evaluated. Lumbar MRI is used to evaluate the improvement of patients' lumbar disc signal, proving that hUC-MSCs transplantation can delay lumbar disc degeneration and treat lumbar degenerative diseases.

Inclusion Criteria:

1. Age: 18-60 years old;
2. The symptoms are lumbago combined with radiating pain of one lower limb;
3. Failed conservative treatment for 3 months, including physical therapy, manual therapy and non-morphine drug therapy;
4. CT/MRI clearly highlighted the nucleus pulposus pressing the nerve root and the location was consistent;
5. Symptoms and imaging showed unilateral lumbar disc herniation;
6. Imaging showed single-level lumbar disc herniation;
7. MRI (T2WI) of Pfirrmann disc degeneration: Grade I-IV;
8. Lumbar disc herniation segments: L3-4, L4-5, L5-S1;
9. Unilateral full endoscopic extraction of nucleus pulposus;
10. Sign the informed consent;
11. No previous history of spinal surgery.

Exclusion Criteria:

1. Previous history of tumor and spinal infection;
2. Patients with severe coagulation disorders, a history of drug abuse or taking oral anticoagulants;
3. Coma or incapacitation;
4. MRI contraindications (history of cardiovascular and cerebrovascular stent implantation, pacemaker, biostimulator, etc.);
5. Pregnant women;
6. Pregnancy or breastfeeding;
7. Have participated in other clinical trials related to this project within the past 30 days;
8. Those who have received stem cell therapy;
9. Poor compliance, or can not correctly understand the cooperation so that it can not complete the interview;
10. Received intervertebral disc interventional therapy within the past 3 months, such as radiofrequency, laser ablation, protease injection, Ozone injection;
11. Highly allergic or have a history of severe allergies;
12. Patients with severe autoimmune disease or who are receiving immunosuppressive therapy;
13. Serious uncontrolled infection or high fever;
14. Patients with shock, failure of vital organs and unstable vital signs;
15. X-ray showed that the degree of stenosis of the diseased segment was more than 30% compared with the adjacent normal segment;
16. Imaging showed lumbar disc herniation complicated with calcification;
17. Imaging showed lumbar disc herniation with Modic Change;
18. Imaging showed lumbar disc herniation complicated with severe spinal stenosis;
19. Imaging showed lumbar disc herniation complicated with lumbar spondylolisthesis;
20. Imaging showed lumbar disc herniation combined with spinal deformity;
21. Mental disorders, cognitive disorders, or other physical diseases affecting the research results;
22. Doctors believe that there are other reasons for not being included in the treatment.