3. Plasma-rich protein injections (PRP):
Some doctors consider PRP injections an experimental treatment as it involves injecting an osteoarthritic knee with plasma-rich protein (PRP) in three steps. Firstly, some blood (usually one to two ounces) is drawn from the patient by a healthcare provider. Then, the blood is centrifuged in the lab to separate blood cells from the platelets that contain growth factors. This process takes from 30 to 45 minutes. Finally, they inject those platelets into the joint.
Current guidelines advise people not to use this therapy, as there are doubts about its safety and effectiveness, on the other hand, there is growing evidence that it is totally safe to use for patients regardless of their age.