60 participants will receive to evaluate the clinical efficacy and safety of dental pulp mesenchymal stem cells in the treatment of primary mild to moderate knee osteoarthritis through a comparative study with sodium hyaluronate and verify the basis of dental pulp mesenchymal stem cells in the treatment of primary knee osteoarthritis, and to explore a more effective and safe clinical treatment of knee osteoarthritis.
To evaluate the clinical efficacy and safety of dental pulp mesenchymal stem cells in the treatment of primary mild to moderate knee osteoarthritis through a comparative study with sodium hyaluronate.~20 participants will receive low dose of dental pulp mesenchymal stem cells, 20 participants will receive high dose and another 20 participants will receive sodium hyaluronate