When Knee Pain Starts Getting in the Way
Knee osteoarthritis can make simple things feel a lot harder than they should. Walking upstairs, exercising, standing for long periods, or even getting up from a chair can become uncomfortable as the joint gets stiffer and more painful over time.
That’s why researchers continue to look for new ways to support knee health beyond traditional pain management. One area getting more attention is umbilical cord-derived mesenchymal stem cells, or UC-MSCs. A 2024 study reviewed several clinical trials to see whether UC-MSC injections could help reduce pain and improve how well the knee works in people with osteoarthritis.
What Did the Researchers Look At?
Instead of testing just one group of patients, researchers combined results from three randomized clinical trials involving a total of 101 people with knee osteoarthritis. Of those, 51 received UC-MSC injections and 50 received another treatment for comparison.
The UC-MSCs were injected directly into the knee joint, and patients were followed for between 6 and 12 months. Two studies compared UC-MSCs with hyaluronic acid injections, while another used saline as the comparison treatment.
Looking at several trials together gave researchers a broader picture of how UC-MSC therapy performed across different groups of patients.
Less Pain and Better Movement
The biggest takeaway was pretty straightforward: people who received UC-MSCs generally reported less pain and better knee function.
Researchers used a common test called the WOMAC score, which measures pain, stiffness, and how difficult everyday activities feel. When the results from all three trials were combined, the UC-MSC group showed significantly better scores, with an average difference of about 25.9 points in favor of UC-MSC treatment.
Another measurement, called the Lysholm Knee Score, looks at pain, swelling, stability, walking, and overall knee function. In the studies that used this score, people receiving UC-MSCs improved by about 18.3 points more than the comparison groups.
In everyday terms, the results suggest that some patients were able to move more comfortably and use their knees more easily after treatment.
Why Are UC-MSCs Being Studied for Knee Health?
UC-MSCs are interesting because researchers believe they may do more than simply help with discomfort. These cells can release biological signals that may help calm inflammation and support a healthier environment inside the joint.
That matters because osteoarthritis is not only about worn-down cartilage. Inflammation and changes throughout the joint can also contribute to pain, stiffness, and reduced mobility.
The hope is that regenerative approaches like UC-MSC therapy may eventually help support joint health in a broader way rather than only managing symptoms.
What About Safety?
Safety is always an important part of studying any new treatment. Across the trials included in this review, some patients experienced temporary knee pain or swelling after the injections, but these symptoms resolved.
Importantly, the researchers reported no serious side effects linked to UC-MSC treatment in the trials they reviewed. That is an encouraging finding as researchers continue studying these treatments in larger groups of patients.
Promising, But Still Early
The overall results were positive, but the researchers also pointed out several limitations. Only three randomized trials were included, and the total number of patients was still relatively small.
The studies also followed patients for no longer than one year. Because of that, researchers still do not know how long the improvements may last or whether similar results would be seen in much larger groups. Larger clinical trials with longer follow-up will be important for confirming the benefits and better understanding the long-term effects.
A Promising Direction for Joint Research
Even with those limitations, the findings are encouraging. Across three clinical trials, UC-MSC injections were linked with better pain scores, improved knee function, and no serious treatment-related safety concerns.
For people dealing with knee osteoarthritis, that makes this an interesting area of regenerative medicine research. Rather than focusing only on temporary pain relief, researchers are exploring whether UC-MSCs may help support a healthier joint environment and improve how the knee feels and functions over time.
More research is still needed, but this study adds to the growing evidence that umbilical cord-derived MSCs may have an important role in the future of joint and mobility care.
Source
Xiao Z, Wang X, Li C, Luo L, Li W. Effects of the umbilical cord mesenchymal stem cells in the treatment of knee osteoarthritis: A systematic review and meta-analysis. Medicine. 2024;103(46). doi: 10.1097/MD.0000000000040490. PMID: 39560593; PMCID: PMC11575993. Available from: https://pmc.ncbi.nlm.nih.gov/articles/PMC11575993/
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