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what is called "stem cell therapy " for knee arthritis is platelet rich plasma knee injections
this is done by doctors at the Rothman Insitute.
The procedure involves the use of a patient’s own blood; specifically, a physician takes blood and places in a filtration system that breaks down red blood cells from the platelets that release proteins and other particles involved in the body’s healing process. The remaining substance is highly concentrated with these platelets and, when injected in to the damaged body part, helps foster new soft tissue or bone cell growth.