Seattle Mariners pitcher Cliff Lee used it for an abdominal strain. Denver Nuggets power forward Kenyon Martin used it on a strained left knee. Last year, Tiger Woods had injections of it in his left knee before four majors and Pittsburgh Steelers Troy Polamalu and Hines Ward used it to treat a strained calf and a sprained knee ligament before the team’s Super Bowl win.
The treatment, known as platelet-rich plasma, or PRP, is one of a growing number of therapies that enhance the body’s ability to heal itself. A physician extracts about one to two ounces of blood from the patient’s vein and spins it in a centrifuge to separate out the platelets, the part of the blood that secretes growth factors to promote clotting and healing. The doctor injects that platelet-rich plasma back into the patient at the site of injury, where it spurs the repair of injured tissue. Most patients experience relief within several weeks.