Fig. 4From: The comparison effects of intra-articular injection of Platelet Rich Plasma (PRP), Plasma Rich in Growth Factor (PRGF), Hyaluronic Acid (HA), and ozone in knee osteoarthritis; a one year randomized clinical trialBar chart of the LEQ scores within and between the groups at the beginning, and 2, 6 and 12 months of follow upBack to article page