Mariners pitcher James Paxton received a Platelet Rich Plasma (PRP) injection to aid his recovery from a strained back muscle — specifically a strained left latissimus dorsi muscle.
Wondering what a PRP injection is?
Here's the definition from Dr. David Geier in his book, Sports Medicine Simplified:
"Platelet-rich plasma (PRP): a treatment developed in recent years to treat a variety of tendon, ligament, and muscle injuries in athletes.
"The procedure involves a physician removing a small amount of blood from the athlete and spinning the blood in a centrifuge to remove its white blood cells and red blood cells. The remaining plasma, with the platelets that contain various growth factors, is injected into the injured area.
"Theoretically, the plasma and its platelets initiate or augment the body’s normal inflammatory reaction. This process is thought to stimulate the formation of collagen in injured tendons and ligaments and help these injured structures heal. While the treatment has received a large deal of media attention due to many famous athletes undergoing the treatment, few scientific studies to date have shown a definitive benefit of platelet-rich plasma over placebo treatments for many injuries."