Umbilical Cord-Derived Mesenchymal Stromal Cells (MSCs) for Knee Osteoarthritis: Repeated MSC Dosing Is Superior to a Single MSC Dose
and to Hyaluronic Acid in a Controlled Randomized Phase I/II Trial

The above paper show how umbilcial cord stem cells greatly improve Osteoarthritis and reduces pain in a clinical study in 2018.