Gypsy said it! I am a runner and have had the condition you mention. Remove your wallet from your back pocket. Perform the (On your back) leg over to the side stretches and knees to chest stretches your doctor can recommend or PM me and I will detail them for you. Back and leg stretches are the secret. Take the Glucosomine, it can't hurt! You will be repairing other cartilege that is wearing in your knees and elsewhere even if it hasn't caused you a problem yet, age and exercise are at work. Glucosomine works for me. Cheers, Chance