Dear Doctor: I read you can use your own stem cells to rejuvenate worn-out knees. Does this really work?

Dear Reader: Worn out is a good way to term what happens to the knee joint with prolonged use. Lets look at how this happens, starting with cartilage.

The lower portion of the knee joint (at the tibia) contains shock absorbers called menisci made of cartilage. You have one on the inner portion and another on the outer portion of each knee. The upper portion of the knee joint (at the femur) is lined with cartilage as well. All of this cartilage helps protect the bones at the joint but it doesnt heal or regenerate well due to limited blood supply. When severe, worn cartilage leads to arthritis of the knee. In knee X-rays of people older than 60, 37 percent have shown evidence of arthritis of the knees.

The intriguing thing about stem cells is they have the ability to become any type of cell the body needs. The cells used for stem cell injections in the knees are called mesenchymal stem cells, and they can differentiate into bone, fat or cartilage cells. These stem cells can come from the fat cells of your body, from your bone marrow or from the inner lining of your knee joint; theyre then replicated in the laboratory and injected into the knee joint.

In a 2014 study, 55 patients who had surgery for meniscal tears of the knees were separated into three groups, with two of the groups receiving stem cell injections. Researchers found, after six weeks, pain had decreased substantially in the two groups that received stem cell injections and the decrease was even greater at one and two years after the injection.

In a 2017 study in the British Journal of Sports Medicine, researchers analyzed six studies that used stem cells for osteoarthritis of the knees. In five of the studies, stem cells were given after surgery to the knee; in the other study, stem cells from a donor were administered without surgery. All the studies showed reduced pain and improved knee function. Further, in three of the four trials, MRIs corroborated the cartilage improvements. However, the authors noted, five of the six studies were of such poor methodology that an overall conclusion about the stem cells effectiveness could not be made.

In all these studies, the most common side effect was knee swelling and stiffness, which improved over time.

There may be benefit to stem cell injections for cartilage loss of the knees, but more data is needed, especially in those who arent having surgery of the knee. Id also like to see more data on this type of therapy as a preventive measure for younger patients before their knees are worn out.

Send questions to askthedoctors@mednet.ucla.edu, or write: Ask the Doctors, c/o Media Relations, UCLA Health, 924 Westwood Blvd., Suite 350, Los Angeles, CA, 90095.

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Stem cell therapy may yield positive results for worn-out knees - Waterloo Cedar Falls Courier