[NY65912]

An explanation from about.com

"Platelet rich plasma (abbreviated PRP) is a new treatment used for some common orthopedic conditions. PRP is a concentration of platelet cells taken from your blood, and these platelets have growth factors that may help in the healing process of chronic injuries. Growth factors are chemicals that signal the body to initiate a healing response. By injecting PRP into areas of an injury, the hope is to stimulate and optimize your body's ability to heal the chronic conditions."

During a PRP injection, a patient’s own blood is drawn and spun in a centrifuge, concentrating the platelets, which are injected back in to the wound. These specially formed proteins accelerate tissue recovery and wound healing and provide powerful potential for healing tendon injuries and stemming the onset of osteoarthritis. The future of medicine, especially the field of orthopedics is increasingly looking towards cutting edge gene therapy and other biologic solutions to solve problems involving tendons, bones, ligaments and cartilage.

All I know is that it is working. My doc is very positive with this therapy for guys like me with ligament damage, due to the injury and the surgery to fix the problem (17 years ago).