I've heard they are using blood injections to cure tennis elbow and other tendon problems. What about joint problems? Can I get an injection of my own blood put in my arthritic knees? Is this idea getting any press?

Blood injection, more formally known as platelet-rich plasma (PRP) is a fairly new treatment tool for a variety of musculoskeletal problems. Platelets taken from the person's own blood are injected into the damaged or injured area. Special growth factors always present in platelets are released and stimulate tissue healing.

Using PRP to treat osteoarthritis is under investigation. In a recent study, scientists from the Netherlands took a look at the mechanism behind this healing process and see if it could be used for osteoarthritic joints. The study was conducted in a laboratory setting. They used human chondrocytes (joint cartilage cells) from older donor adults.

By working at the cellular level of investigation, they were able to see two things: 1) the cascade of events that occurs when a cartilage cell is exposed to platelet-rich plasma (PRP) and 2) the effect PRP has on joint cartilage cells.

The authors admit that what happens in a sterile lab may not mimic exactly what happens in the human body. But it is a place to start with the hope of finding better ways to stop the arthritic degenerative process in our joints as we age.

How does this study help the average person with joint osteoarthritis? It doesn't quite yet. But it is an important step in understanding the processes by which joint destruction occurs. If scientists can identify specific mechanisms at the cellular level that lead to chondrocyte destruction AND turn those signals off (either by interrupting the domino cascade once it starts or stopping the first domino from tipping), then we may have some clinical applications.

The authors of this study say this is just one step of many needed to fully investigate the use of PRP for joint osteoarthritis. With so much variation in chondrocytes from person to person and many different ways to prepare the platelet-rich plasma, there is a need for further concentrated study in this area. The authors conclude if an effective, self-induced, low-cost treatment can be found from these studies, then it will be time and money well spent.