Platelet Rich Plasma (PRP) is plasma, the liquid contained in blood, which has a concentrated volume of platelets, cells that do not have a nucleus containing DNA. Platelets contain a high level of bioactive proteins, which make growth factors, compounds that facilitate treatment of damaged or injured tissues. A high concentration of these growth factors can assist in treating connective tissues—tendons (which connect muscle to bone) and ligaments (which connect bone to bone)—which are composed of collagen fibers. The PRP is injected into the damaged area and the growth factors contained in the platelets stimulate improvement in the injured tissue. Severe sprains and strains can be helped by PRP therapy.