Most everyone thinks of blood platelets as being responsible for blood clotting after injury, which is true.
What many people do not know is that blood platelets serve two other important functions. Blood platelets are responsible for bringing the white blood cells to the injured area to clean up the remains of dead and injured cells. Blood platelets also release growth factors that are directly responsible for tissue regeneration.
Platelet rich plasma therapy treatment can be used for tendon, ligament, muscle, and joint injuries, which are normally slow to heal.
Full article: Platelet Rich Plasma Therapy